diff --git a/mindspore/lite/src/runtime/kernel/opencl/cl/conv2d.cl b/mindspore/lite/src/runtime/kernel/opencl/cl/conv2d.cl
index cdf8e06205..a89146d904 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/cl/conv2d.cl
+++ b/mindspore/lite/src/runtime/kernel/opencl/cl/conv2d.cl
@@ -67,7 +67,7 @@ __kernel void Conv2D_H1W1C1(__read_only image2d_t input, __write_only image2d_t
     }
   }
 
-  if (bias) {
+  if (bias != 0) {
     out_h0_w0_c0 += bias[co_slice0];
   }
 
@@ -135,7 +135,7 @@ __kernel void Conv2D_H2W1C1(__read_only image2d_t input, __write_only image2d_t
     }
   }
 
-  if (bias) {
+  if (bias != 0) {
     out_h0_w0_c0 += bias[co_slice0];
     out_h1_w0_c0 += bias[co_slice0];
   }
@@ -224,7 +224,7 @@ __kernel void Conv2D_H2W1C2(__read_only image2d_t input, __write_only image2d_t
     }
   }
 
-  if (bias) {
+  if (bias != 0) {
     out_h0_w0_c0 += bias[co_slice0];
     out_h1_w0_c0 += bias[co_slice0];
     out_h0_w0_c1 += bias[co_slice1];
@@ -357,7 +357,7 @@ __kernel void Conv2D_H2W2C2(__read_only image2d_t input, __write_only image2d_t
     }
   }
 
-  if (bias) {
+  if (bias != 0) {
     out_h0_w0_c0 += bias[co_slice0];
     out_h0_w1_c0 += bias[co_slice0];
     out_h1_w0_c0 += bias[co_slice0];
diff --git a/mindspore/lite/src/runtime/kernel/opencl/cl/space_to_depth.cl b/mindspore/lite/src/runtime/kernel/opencl/cl/space_to_depth.cl
index a968cec81e..f1aaf13a45 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/cl/space_to_depth.cl
+++ b/mindspore/lite/src/runtime/kernel/opencl/cl/space_to_depth.cl
@@ -10,6 +10,7 @@ __kernel void SpaceToDepth(__read_only image2d_t src_data, __write_only image2d_
   int Y = get_global_id(1);  // W
   int Z = get_global_id(2);  // H * N
   if (X >= out_shape.w || Y >= out_shape.z || Z >= out_shape.x * out_shape.y) return;
+  if (out_shape.y == 0 || ci_size == 0 || block_size == 0) return;
   int N = Z / out_shape.y;
   int H = Z % out_shape.y;
   int co_base = X * C4NUM;
@@ -43,6 +44,7 @@ __kernel void SpaceToDepthAlign(__read_only image2d_t src_data, __write_only ima
   int Y = get_global_id(1);  // W
   int Z = get_global_id(2);  // H * N
   if (X >= out_shape.w || Y >= out_shape.z || Z >= out_shape.x * out_shape.y) return;
+  if (out_shape.y == 0 || in_shape.w == 0 || block_size == 0) return;
 
   int N = Z / out_shape.y;
   int H = Z % out_shape.y;
diff --git a/mindspore/lite/src/runtime/kernel/opencl/cl/winograd.cl b/mindspore/lite/src/runtime/kernel/opencl/cl/winograd.cl
index 8e2029532a..fad2a98e96 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/cl/winograd.cl
+++ b/mindspore/lite/src/runtime/kernel/opencl/cl/winograd.cl
@@ -171,7 +171,7 @@ __kernel void Winograd36To4x4(__read_only image2d_t input, __write_only image2d_
       acc += AtM_row[y] * At[idx];
     }
 
-    if (bias) {
+    if (bias != 0) {
       acc += bias[slice];
     }
 
diff --git a/mindspore/lite/src/runtime/kernel/opencl/kernel/arithmetic_self.cc b/mindspore/lite/src/runtime/kernel/opencl/kernel/arithmetic_self.cc
index 2a711722d1..3ebb7e90b2 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/kernel/arithmetic_self.cc
+++ b/mindspore/lite/src/runtime/kernel/opencl/kernel/arithmetic_self.cc
@@ -42,6 +42,8 @@ using mindspore::schema::PrimitiveType_Square;
 namespace mindspore::kernel {
 
 void ArithmeticSelfOpenCLKernel::GetKernelName(std::string *kernel_name, ArithmeticSelfParameter *param) {
+  MS_ASSERT(kernel_name);
+  MS_ASSERT(param);
   switch (param->op_parameter_.type_) {
     case PrimitiveType_Abs:
       kernel_name[0] += "_ElementAbs";
diff --git a/mindspore/lite/src/runtime/kernel/opencl/kernel/space_to_batch_nd.cc b/mindspore/lite/src/runtime/kernel/opencl/kernel/space_to_batch_nd.cc
index 9776508fc6..aa4388b0ea 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/kernel/space_to_batch_nd.cc
+++ b/mindspore/lite/src/runtime/kernel/opencl/kernel/space_to_batch_nd.cc
@@ -51,6 +51,8 @@ int SpaceToBatchNDOpenCLKernel::CheckSpecs() {
     MS_LOG(ERROR) << "block_sizes_ must > 1, actual " << param->block_sizes_[0] << ", " << param->block_sizes_[1];
     return RET_ERROR;
   }
+  MS_ASSERT(param->block_sizes_[0]);
+  MS_ASSERT(param->block_sizes_[1]);
   if (param->padded_in_shape_[kNHWC_H] % param->block_sizes_[0] ||
       param->padded_in_shape_[kNHWC_W] % param->block_sizes_[1]) {
     MS_LOG(ERROR) << "padded shape must be multiple of block!";
diff --git a/mindspore/lite/src/runtime/kernel/opencl/kernel/strided_slice.cc b/mindspore/lite/src/runtime/kernel/opencl/kernel/strided_slice.cc
index a39edd1b6d..482d0ea351 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/kernel/strided_slice.cc
+++ b/mindspore/lite/src/runtime/kernel/opencl/kernel/strided_slice.cc
@@ -169,6 +169,7 @@ void StridedSliceOpenCLKernel::SetGlobalLocal() {
   const int max_divider = 8;
   auto max_work_group_size = ocl_runtime_->DeviceMaxWorkGroupSize();
   size_t local_c = GetMaxDivisorStrategy0(global[2], max_divider);
+  local_c = std::max<size_t>(local_c, 1);
   size_t local_hw = max_work_group_size / local_c;
   size_t local_h = std::min(UP_DIV(global[0], 2), local_hw);
   size_t local_w = std::min(local_hw / local_h, global[1]);
diff --git a/mindspore/lite/src/runtime/kernel/opencl/opencl_kernel.h b/mindspore/lite/src/runtime/kernel/opencl/opencl_kernel.h
index beae7c39f9..c96935afba 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/opencl_kernel.h
+++ b/mindspore/lite/src/runtime/kernel/opencl/opencl_kernel.h
@@ -36,6 +36,8 @@ struct OpenCLToFormatParameter {
 
 template <typename SrcT, typename DstT>
 void Broadcast2GpuShape(DstT *dst, const SrcT *src, int src_num) {
+  MS_ASSERT(dst);
+  MS_ASSERT(src);
   auto *N = dst;
   auto *H = dst + 1;
   auto *W = dst + 2;
@@ -54,13 +56,15 @@ void Broadcast2GpuShape(DstT *dst, const SrcT *src, int src_num) {
     *H = src[1];
     *W = src[2];
     *C = src[3];
-  } else if (src_num >= 5) {
+  } else if (src_num > 4) {
     MS_LOG(ERROR) << "GPU doesn't support ndim>=" << src_num;
   }
 }
 
 template <typename SrcT, typename DstT>
 void Broadcast2GpuShape(DstT *dst, const SrcT *src, int src_num, DstT default_value) {
+  MS_ASSERT(dst);
+  MS_ASSERT(src);
   for (int i = 0; i < 4; ++i) {
     dst[i] = default_value;
   }
@@ -101,6 +105,7 @@ struct GpuTensorInfo {
   size_t RowPitch() const {
     auto runtime_wrapper = lite::opencl::OpenCLRuntimeWrapper();
     int alignment = runtime_wrapper.GetInstance()->GetImagePitchAlignment();
+    MS_ASSERT(alignment);
     size_t row_pitch = UP_ROUND(width, alignment) * FLT4_size;
     return row_pitch;
   }
@@ -143,31 +148,31 @@ class OpenCLKernel : public LiteKernel {
   int AlignGlobalLocal(const std::vector<size_t> &global, const std::vector<size_t> &local) {
     std::vector<size_t> internal_global_ws = global;
     for (size_t i = 0; i < local.size(); ++i) {
-      internal_global_ws[i] = UP_ROUND(global[i], local[i]);
+      internal_global_ws.at(i) = UP_ROUND(global.at(i), local.at(i));
     }
 
     MS_LOG(DEBUG) << "global size: " << global.size() << ", local size: " << local.size();
     for (size_t i = 0; i < global.size(); i++) {
-      MS_LOG(DEBUG) << "global[" << i << "] = " << global[i];
+      MS_LOG(DEBUG) << "global[" << i << "] = " << global.at(i);
     }
     for (size_t i = 0; i < local.size(); i++) {
-      MS_LOG(DEBUG) << "local[" << i << "] = " << local[i];
+      MS_LOG(DEBUG) << "local[" << i << "] = " << local.at(i);
     }
 
     if (global.size() == 1) {
-      global_range_ = cl::NDRange(internal_global_ws[0]);
+      global_range_ = cl::NDRange(internal_global_ws.at(0));
       if (!local.empty()) {
-        local_range_ = cl::NDRange(local[0]);
+        local_range_ = cl::NDRange(local.at(0));
       }
     } else if (global.size() == 2) {
-      global_range_ = cl::NDRange(internal_global_ws[0], internal_global_ws[1]);
+      global_range_ = cl::NDRange(internal_global_ws.at(0), internal_global_ws.at(1));
       if (!local.empty()) {
-        local_range_ = cl::NDRange(local[0], local[1]);
+        local_range_ = cl::NDRange(local.at(0), local.at(1));
       }
     } else if (global.size() == 3) {
-      global_range_ = cl::NDRange(internal_global_ws[0], internal_global_ws[1], internal_global_ws[2]);
+      global_range_ = cl::NDRange(internal_global_ws.at(0), internal_global_ws.at(1), internal_global_ws.at(2));
       if (!local.empty()) {
-        local_range_ = cl::NDRange(local[0], local[1], local[2]);
+        local_range_ = cl::NDRange(local.at(0), local.at(1), local.at(2));
       }
     } else {
       MS_LOG(ERROR) << "Not supported NDRange!";
@@ -191,6 +196,7 @@ class OpenCLKernel : public LiteKernel {
     return RET_ERROR;
   }
   int GetImageSize(size_t idx, std::vector<size_t> *img_size) {
+    MS_ASSERT(img_size);
     if (idx >= out_tensors_.size()) {
       return RET_ERROR;
     }
diff --git a/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.cc b/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.cc
index 3fcb8aab6c..7e77bfd125 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.cc
+++ b/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.cc
@@ -28,11 +28,12 @@ using mindspore::lite::opencl::MemType;
 
 SubGraphOpenCLKernel::~SubGraphOpenCLKernel() { UnInit(); }
 
-int SubGraphOpenCLKernel::ReplaceOutTensorAndKernelToNull(
+void SubGraphOpenCLKernel::ReplaceOutTensorAndKernelToNull(
   const std::vector<lite::Tensor *> &in_tensors, const std::vector<std::vector<kernel::LiteKernel *>> &in_kernels,
   MemType mem_type) {
   for (size_t i = 0; i < in_tensors.size(); ++i) {
     for (auto &jv : in_kernels.at(i)) {
+      MS_ASSERT(jv);
       auto tensors = (mem_type == MemType::IMG) ? jv->in_tensors() : jv->out_tensors();
       auto ft = std::find_if(tensors.begin(), tensors.end(),
                              [&in_tensors, &i](lite::Tensor *kv) { return kv == in_tensors.at(i); });
@@ -43,6 +44,7 @@ int SubGraphOpenCLKernel::ReplaceOutTensorAndKernelToNull(
       std::replace_if(
         kernels.begin(), kernels.end(),
         [this, &in_tensors, &i](kernel::LiteKernel *kv) {
+          MS_ASSERT(kv);
           return std::find_if(kv->in_tensors().begin(), kv->in_tensors().end(),
                               [&in_tensors, &i](lite::Tensor *xv) { return xv == in_tensors.at(i); }) !=
                    kv->in_tensors().end() &&
@@ -58,14 +60,16 @@ int SubGraphOpenCLKernel::ReplaceOutTensorAndKernelToNull(
       }
     }
   }
-  return RET_OK;
 }
-int SubGraphOpenCLKernel::ReplaceOutTensorAndKernelToConvert(const lite::Tensor *in_tensor,
-                                                             const std::vector<kernel::LiteKernel *> &in_kernels,
-                                                             lite::Tensor *new_tensor,
-                                                             kernel::LiteKernel *in_convert_op, MemType mem_type) {
+
+void SubGraphOpenCLKernel::ReplaceOutTensorAndKernelToConvert(const lite::Tensor *in_tensor,
+                                                              const std::vector<kernel::LiteKernel *> &in_kernels,
+                                                              lite::Tensor *new_tensor,
+                                                              kernel::LiteKernel *in_convert_op, MemType mem_type) {
+  MS_ASSERT(in_convert_op);
   auto in_opencl_op = reinterpret_cast<OpenCLKernel *>(in_convert_op);
   for (auto &iv : in_kernels) {
+    MS_ASSERT(iv);
     auto kernels = (mem_type == MemType::IMG) ? iv->in_kernels() : iv->out_kernels();
     auto fk = std::find_if(kernels.begin(), kernels.end(), [&](kernel::LiteKernel *kv) { return kv == nullptr; });
     if (fk != kernels.end()) {
@@ -90,13 +94,16 @@ int SubGraphOpenCLKernel::ReplaceOutTensorAndKernelToConvert(const lite::Tensor
       in_convert_op->AddInKernel(iv);
     }
   }
-  return RET_OK;
 }
+
 int SubGraphOpenCLKernel::GenToFormatOp(const std::vector<lite::Tensor *> &in_tensors,
                                         const std::vector<std::vector<kernel::LiteKernel *>> &in_kernels,
                                         std::vector<lite::Tensor *> *out_tensors,
                                         std::vector<OpenCLToFormatParameter *> *out_parameters,
                                         std::vector<LiteKernel *> *out_convert_ops, MemType mem_type) {
+  MS_ASSERT(out_tensors);
+  MS_ASSERT(out_parameters);
+  MS_ASSERT(out_convert_ops);
   out_tensors->clear();
   out_parameters->clear();
   out_convert_ops->clear();
@@ -167,6 +174,7 @@ int SubGraphOpenCLKernel::GenToFormatOp(const std::vector<lite::Tensor *> &in_te
     // replace in_tensor of inner kernel which use out tensor
     if (mem_type == MemType::BUF) {
       for (auto &iv : loop_kernels[i]) {
+        MS_ASSERT(iv);
         auto tensors = iv->in_tensors();
         auto jv = std::find(tensors.begin(), tensors.end(), in_tensors.at(i));
         if (jv != tensors.end()) {
@@ -185,9 +193,11 @@ int SubGraphOpenCLKernel::Init() {
   allocator_ = ocl_runtime_->GetAllocator();
   MS_LOG(DEBUG) << "input num=" << in_tensors_.size() << ", output num=" << out_tensors_.size();
   for (const auto tensor : in_tensors_) {
+    MS_ASSERT(tensor);
     tensor->set_allocator(allocator_);
   }
   for (const auto tensor : out_tensors_) {
+    MS_ASSERT(tensor);
     tensor->set_allocator(allocator_);
   }
 
@@ -223,72 +233,83 @@ int SubGraphOpenCLKernel::Init() {
   return RET_OK;
 }
 
-int SubGraphOpenCLKernel::UpdateTensorDataType() {
+void SubGraphOpenCLKernel::UpdateTensorDataType() {
   bool is_fp16 = ocl_runtime_->GetFp16Enable();
+  MS_ASSERT(in_tensors_[0]);
   if (is_fp16 && (in_tensors_[0]->data_type() == kNumberTypeFloat32)) {
     std::set<lite::Tensor *> out_set;
     out_set.insert(in_tensors_.begin(), in_tensors_.end());
     out_set.insert(out_tensors_.begin(), out_tensors_.end());
     for (auto iv : nodes_) {
+      MS_ASSERT(iv);
       auto cur_outs = iv->out_tensors();
       for (auto jv : cur_outs) {
         if (out_set.count(jv) == 0) {
+          MS_ASSERT(jv);
           jv->set_data_type(kNumberTypeFloat16);
         }
       }
     }
   }
-  return RET_OK;
 }
 
 int SubGraphOpenCLKernel::MallocTensorWithReuse() {
+  int ret;
   kernel::LiteKernelUtil::InitTensorRefCount(nodes_);
   for (auto *kernel : nodes_) {
-    MS_ASSERT(nullptr != kernel);
+    MS_ASSERT(kernel);
     auto *op_kernel = reinterpret_cast<kernel::OpenCLKernel *>(kernel);
     auto outputs = kernel->out_tensors();
     for (auto i = 0; i < outputs.size(); ++i) {
       auto *output = outputs.at(i);
-      MS_ASSERT(nullptr != output);
+      MS_ASSERT(output);
       if (op_kernel->GetMemType() == MemType::IMG) {
         std::vector<size_t> img_size;
-        op_kernel->GetImageSize(i, &img_size);
+        ret = op_kernel->GetImageSize(i, &img_size);
+        if (ret != RET_OK) {
+          MS_LOG(WARNING) << "GetImageSize failed";
+        }
         auto data_ptr = allocator_->Malloc(output->Size(), img_size);
         output->set_data(data_ptr);
       } else {
-        output->MallocData(allocator_);
+        ret = output->MallocData(allocator_);
+        if (ret != RET_OK) {
+          MS_LOG(WARNING) << "MallocData failed";
+        }
       }
       output->set_allocator(allocator_);
     }
     for (auto input_kernel : kernel->in_kernels()) {
-      MS_ASSERT(nullptr != input_kernel);
-      auto ret = input_kernel->DecOutTensorRefCount();
-      if (0 != ret) {
+      MS_ASSERT(input_kernel);
+      ret = input_kernel->DecOutTensorRefCount();
+      if (ret != RET_OK) {
         MS_LOG(WARNING) << "DecOutTensorRefCount for kernel" << kernel->name() << " failed";
       }
     }
   }
   for (auto kernel : out_kernels_) {
-    MS_ASSERT(nullptr != kernel);
-    auto ret = kernel->DecOutTensorRefCount();
-    if (0 != ret) {
+    MS_ASSERT(kernel);
+    ret = kernel->DecOutTensorRefCount();
+    if (ret != RET_OK) {
       MS_LOG(WARNING) << "DecOutTensorRefCount for kernel" << kernel->name() << " failed";
     }
   }
   return RET_OK;
 }
 
-int SubGraphOpenCLKernel::GetKernelFromToTensor(const std::vector<lite::Tensor *> &in_tensors,
-                                                const std::vector<kernel::LiteKernel *> &in_kernels,
-                                                std::vector<std::vector<kernel::LiteKernel *>> *out_kernels,
-                                                bool is_from) {
+void SubGraphOpenCLKernel::GetKernelFromToTensor(const std::vector<lite::Tensor *> &in_tensors,
+                                                 const std::vector<kernel::LiteKernel *> &in_kernels,
+                                                 std::vector<std::vector<kernel::LiteKernel *>> *out_kernels,
+                                                 bool is_from) {
   std::vector<std::set<lite::Tensor *>> ksets;
   for (auto jv : in_kernels) {
+    MS_ASSERT(jv);
     auto tens = is_from ? jv->in_tensors() : jv->out_tensors();
     std::set<lite::Tensor *> kset;
     kset.insert(tens.begin(), tens.end());
     ksets.emplace_back(kset);
   }
+  MS_ASSERT(out_kernels);
   for (auto in_tensor : in_tensors) {
     std::vector<kernel::LiteKernel *> kvec;
     for (size_t j = 0; j < in_kernels.size(); ++j) {
@@ -298,13 +319,13 @@ int SubGraphOpenCLKernel::GetKernelFromToTensor(const std::vector<lite::Tensor *
     }
     out_kernels->emplace_back(kvec);
   }
-  return RET_OK;
 }
 
-int SubGraphOpenCLKernel::GetInOutNodes() {
+void SubGraphOpenCLKernel::GetInOutNodes() {
   std::vector<std::set<lite::Tensor *>> ksets_in;
   std::vector<std::set<lite::Tensor *>> ksets_out;
   for (auto jv : nodes_) {
+    MS_ASSERT(jv);
     std::set<lite::Tensor *> kset;
     kset.insert(jv->in_tensors().begin(), jv->in_tensors().end());
     ksets_in.emplace_back(kset);
@@ -323,10 +344,15 @@ int SubGraphOpenCLKernel::GetInOutNodes() {
       out_nodes_.emplace_back(nodes_.at(j));
     }
   }
-  return RET_OK;
 }
 
 int SubGraphOpenCLKernel::Prepare() {
+  executor_ = new (std::nothrow) lite::opencl::OpenCLExecutor();
+  if (executor_ == nullptr) {
+    MS_LOG(ERROR) << "Create OpenCLExecutor fail";
+    return RET_ERROR;
+  }
+
   auto ret = Init();
   if (ret != RET_OK) {
     MS_LOG(ERROR) << "OpenCL subgraph init fail";
@@ -335,7 +361,7 @@ int SubGraphOpenCLKernel::Prepare() {
   return RET_OK;
 }
 
-int SubGraphOpenCLKernel::UnInit() {
+void SubGraphOpenCLKernel::UnInit() {
   for (const auto &tensor : in_convert_tensors_) {
     delete tensor;
   }
@@ -351,7 +377,6 @@ int SubGraphOpenCLKernel::UnInit() {
   in_convert_ops_.clear();
   out_convert_ops_.clear();
   delete this->executor_;
-  return RET_OK;
 }
 
 int SubGraphOpenCLKernel::InferShape() { return RET_OK; }
@@ -363,21 +388,28 @@ int SubGraphOpenCLKernel::Run() {
     MS_LOG(ERROR) << "executor is nullptr";
     return RET_ERROR;
   }
+  int ret;
   for (auto &tensor : in_tensors_) {
+    MS_ASSERT(tensor);
     if (tensor->data_c() == nullptr) {
       MS_LOG(ERROR) << "OpenCL subgraph input tensor data is null";
       return RET_ERROR;
     }
     allocator_->UnmapBuffer(tensor->data_c());
+    ret = allocator_->UnmapBuffer(tensor->data_c());
+    if (ret != RET_OK) {
+      return ret;
+    }
   }
 
-  auto ret = executor_->Run(in_tensors_, out_tensors_, nodes_, allocator_);
-  if (RET_OK != ret) {
+  ret = executor_->Run(in_tensors_, out_tensors_, nodes_, allocator_);
+  if (ret != RET_OK) {
     MS_LOG(ERROR) << "Run opencl executor failed: " << ret;
     return ret;
   }
-  ocl_runtime_->SyncCommandQueue();
-
+  if (!ocl_runtime_->SyncCommandQueue()) {
+    return RET_ERROR;
+  }
   return RET_OK;
 }
 }  // namespace mindspore::kernel
diff --git a/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.h b/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.h
index 34de3605c5..630273204a 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.h
+++ b/mindspore/lite/src/runtime/kernel/opencl/subgraph_opencl_kernel.h
@@ -41,7 +41,6 @@ class SubGraphOpenCLKernel : public SubGraphKernel {
     ocl_runtime_ = ocl_runtime_wrap_.GetInstance();
     subgraph_type_ = kGpuSubGraph;
     this->name_ = "GpuSubGraph";
-    this->executor_ = new lite::opencl::OpenCLExecutor();
     nodes_set_.insert(nodes.begin(), nodes.end());
   }
   ~SubGraphOpenCLKernel() override;
@@ -56,23 +55,23 @@ class SubGraphOpenCLKernel : public SubGraphKernel {
   int Run(const KernelCallBack &before, const KernelCallBack &after) override { return this->Run(); };
 
  private:
-  int UnInit();
-  int UpdateTensorDataType();
+  void UnInit();
+  void UpdateTensorDataType();
   int MallocTensorWithReuse();
-  int ReplaceOutTensorAndKernelToNull(const std::vector<lite::Tensor *> &in_tensors,
-                                      const std::vector<std::vector<kernel::LiteKernel *>> &in_kernels,
-                                      lite::opencl::MemType mem_type);
-  int ReplaceOutTensorAndKernelToConvert(const lite::Tensor *in_tensor,
-                                         const std::vector<kernel::LiteKernel *> &in_kernels, lite::Tensor *new_tensor,
-                                         kernel::LiteKernel *in_convert_op, lite::opencl::MemType mem_type);
-  int GetInOutNodes();
+  void ReplaceOutTensorAndKernelToNull(const std::vector<lite::Tensor *> &in_tensors,
+                                       const std::vector<std::vector<kernel::LiteKernel *>> &in_kernels,
+                                       lite::opencl::MemType mem_type);
+  void ReplaceOutTensorAndKernelToConvert(const lite::Tensor *in_tensor,
+                                          const std::vector<kernel::LiteKernel *> &in_kernels, lite::Tensor *new_tensor,
+                                          kernel::LiteKernel *in_convert_op, lite::opencl::MemType mem_type);
+  void GetInOutNodes();
   int GenToFormatOp(const std::vector<lite::Tensor *> &in_tensors,
                     const std::vector<std::vector<kernel::LiteKernel *>> &in_kernels,
                     std::vector<lite::Tensor *> *out_tensors, std::vector<OpenCLToFormatParameter *> *out_parameters,
                     std::vector<LiteKernel *> *out_convert_ops, lite::opencl::MemType mem_type);
-  int GetKernelFromToTensor(const std::vector<lite::Tensor *> &in_tensors,
-                            const std::vector<kernel::LiteKernel *> &in_kernels,
-                            std::vector<std::vector<kernel::LiteKernel *>> *out_kernels, bool is_from);
+  void GetKernelFromToTensor(const std::vector<lite::Tensor *> &in_tensors,
+                             const std::vector<kernel::LiteKernel *> &in_kernels,
+                             std::vector<std::vector<kernel::LiteKernel *>> *out_kernels, bool is_from);
   lite::opencl::OpenCLAllocator *allocator_{nullptr};
   std::vector<lite::Tensor *> in_convert_tensors_;
   std::vector<lite::Tensor *> out_convert_tensors_;
diff --git a/mindspore/lite/src/runtime/kernel/opencl/utils.cc b/mindspore/lite/src/runtime/kernel/opencl/utils.cc
index fa3e8fc5c5..6904c800f4 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/utils.cc
+++ b/mindspore/lite/src/runtime/kernel/opencl/utils.cc
@@ -87,6 +87,7 @@ int GetMaxDivisorStrategy1(int x, int divisor) {
 }
 
 std::vector<size_t> GetCommonGlobalSize(const std::vector<size_t> &local, const std::vector<size_t> &global) {
+  MS_ASSERT(local.size() == global.size() && local.size() == 3);
   std::vector<size_t> result(3);
   for (int i = 0; i < 3; ++i) {
     result[i] = UP_ROUND(global[i], local[i]);
@@ -95,6 +96,7 @@ std::vector<size_t> GetCommonGlobalSize(const std::vector<size_t> &local, const
 }
 
 std::vector<size_t> GetCommonLocalSize(const std::vector<size_t> &global, int max_size) {
+  MS_ASSERT(global.size() == 3);
   size_t local_z = GetMaxDivisorStrategy0(global[2], 8);
   if (local_z == 0) {
     MS_LOG(ERROR) << "Divide by zero";
@@ -239,6 +241,7 @@ std::string CLErrorCode(cl_int error_code) {
 }
 
 int WriteToBin(const std::string &file_path, void *data, size_t size) {
+  MS_ASSERT(data);
   std::ofstream out_file;
 
   out_file.open(file_path.c_str(), std::ios::binary);
@@ -256,7 +259,7 @@ int WriteToBin(const std::string &file_path, void *data, size_t size) {
 }
 
 void PrintTensor(const lite::Tensor *tensor, MemType mem_type, int n, const std::string &out_file) {
-  if (tensor->data_c() == nullptr) {
+  if (tensor == nullptr || tensor->data_c() == nullptr) {
     return;
   }
 
@@ -305,6 +308,9 @@ void PrintTensor(const lite::Tensor *tensor, MemType mem_type, int n, const std:
 }
 
 void PrintKernelOutput(OpenCLKernel *kernel, int n, const std::string &out_file) {
+  if (kernel == nullptr) {
+    return;
+  }
   printf("%-30s", kernel->name().c_str());
   if (!kernel->out_tensors().empty()) {
     PrintTensor(kernel->out_tensors()[0], kernel->GetMemType(), n, out_file);
diff --git a/mindspore/lite/src/runtime/kernel/opencl/utils.h b/mindspore/lite/src/runtime/kernel/opencl/utils.h
index 228682358c..5e71f8bb1d 100644
--- a/mindspore/lite/src/runtime/kernel/opencl/utils.h
+++ b/mindspore/lite/src/runtime/kernel/opencl/utils.h
@@ -61,6 +61,8 @@ std::vector<size_t> GetImage2dShapeFromNHWC(const std::vector<int> &tensor_shape
 
 template <class T1, class T2>
 void PackNCHWToNC4HW4(void *src, void *dst, int batch, int plane, int channel, const std::function<T2(T1)> &to_dtype) {
+  MS_ASSERT(src);
+  MS_ASSERT(dst);
   int c4 = UP_DIV(channel, C4NUM);
   for (int b = 0; b < batch; b++) {
     int src_offset = b * plane * channel;
@@ -81,6 +83,8 @@ void PackNCHWToNC4HW4(void *src, void *dst, int batch, int plane, int channel, c
 
 template <class T1, class T2>
 void PackNHWCToNHWC4(void *src, void *dst, int batch, int plane, int channel, const std::function<T2(T1)> &to_dtype) {
+  MS_ASSERT(src);
+  MS_ASSERT(dst);
   int c4 = UP_DIV(channel, C4NUM);
   int nhwc4_batch_unit_offset = c4 * C4NUM * plane;
   int ic_remainder_ = channel % C4NUM;
@@ -106,6 +110,8 @@ void PackNHWCToNHWC4(void *src, void *dst, int batch, int plane, int channel, co
 
 template <class T1, class T2>
 void PackNHWCToNC4HW4(void *src, void *dst, int batch, int plane, int channel, const std::function<T2(T1)> &to_dtype) {
+  MS_ASSERT(src);
+  MS_ASSERT(dst);
   int c4 = UP_DIV(channel, C4NUM);
   for (int b = 0; b < batch; b++) {
     int src_oc_offset = b * plane * channel;
@@ -142,6 +148,11 @@ std::vector<T> MatrixMultiply(const T A[], const T B[], int M, int N, int K) {
 template <typename SRC_T, typename DST_T>
 void ConvertConvWeight4DTo7D(void *src, void *dst, size_t CO, size_t KH, size_t KW, size_t CI, size_t OGroup = 1,
                              const size_t CI_TILE = 4, const size_t CO_TILE = 4) {
+  MS_ASSERT(src);
+  MS_ASSERT(dst);
+  MS_ASSERT(CI_TILE);
+  MS_ASSERT(CO_TILE);
+  MS_ASSERT(OGroup);
   if (CO_TILE == 0 || CI_TILE == 0) return;
   auto origin_weight = reinterpret_cast<SRC_T *>(src);
   auto packed_weight = reinterpret_cast<DST_T *>(dst);
diff --git a/mindspore/lite/src/runtime/opencl/opencl_allocator.cc b/mindspore/lite/src/runtime/opencl/opencl_allocator.cc
index 998399a1a9..ce98df79e1 100644
--- a/mindspore/lite/src/runtime/opencl/opencl_allocator.cc
+++ b/mindspore/lite/src/runtime/opencl/opencl_allocator.cc
@@ -66,6 +66,7 @@ void *OpenCLAllocator::MinimumFit(size_t size, const std::vector<size_t> &img_si
 
 void *OpenCLAllocator::CreateBuffer(size_t size, void *data, size_t flags, cl::Buffer **buffer) {
   cl_int ret = CL_SUCCESS;
+  MS_ASSERT(buffer);
   *buffer = new (std::nothrow) cl::Buffer(*ocl_runtime_->Context(), flags, size, data, &ret);
   if (*buffer == nullptr) {
     MS_LOG(ERROR) << "Create OpenCL buffer failed! (ERROR CODE: " << ret << ")";
@@ -78,7 +79,11 @@ void *OpenCLAllocator::CreateBuffer(size_t size, void *data, size_t flags, cl::B
     return nullptr;
   }
   cl::Memory *mem = *buffer;
-  ocl_runtime_->UnmapBuffer(*mem, host_ptr);
+  MS_ASSERT(mem);
+  ret = ocl_runtime_->UnmapBuffer(*mem, host_ptr);
+  if (ret != RET_OK) {
+    MS_LOG(WARNING) << "UnmapBuffer failed.";
+  }
   return host_ptr;
 }
 
@@ -110,7 +115,10 @@ void *OpenCLAllocator::CreateImage2D(size_t size, const std::vector<size_t> &img
       return nullptr;
     }
     cl::Memory *mem = *image;
-    ocl_runtime_->UnmapBuffer(*mem, host_ptr);
+    ret = ocl_runtime_->UnmapBuffer(*mem, host_ptr);
+    if (ret != CL_SUCCESS) {
+      MS_LOG(WARNING) << "UnmapBuffer failed.";
+    }
   }
   return host_ptr;
 }
@@ -131,7 +139,7 @@ void *OpenCLAllocator::Malloc(size_t size, const std::vector<size_t> &img_size,
   }
   Lock();
   void *host_ptr = MinimumFit(size, img_size);
-  if ((host_ptr != nullptr) && (data == nullptr)) {
+  if (host_ptr != nullptr && data == nullptr) {
     UnLock();
     return host_ptr;
   }
@@ -188,7 +196,10 @@ void OpenCLAllocator::Free(void *buf) {
   auto iter = allocated_list_.find(buf);
   if (iter != allocated_list_.end()) {
     if (iter->second->map_flags) {
-      UnmapBuffer(buf);
+      int ret = UnmapBuffer(buf);
+      if (ret != RET_OK) {
+        MS_LOG(WARNING) << "UnmapBuffer failed.";
+      }
       iter->second->map_flags = false;
     }
     auto mem_buf = iter->second;
@@ -240,7 +251,10 @@ void OpenCLAllocator::Clear() {
   auto svm_capabilities = ocl_runtime_->GetSVMCapabilities();
   for (auto it = allocated_list_.begin(); it != allocated_list_.end(); it++) {
     if (it->second->map_flags) {
-      UnmapBuffer(it->second->host_ptr_);
+      int ret = UnmapBuffer(it->second->host_ptr_);
+      if (ret != RET_OK) {
+        MS_LOG(WARNING) << "UnmapBuffer failed.";
+      }
     }
     if (svm_capabilities) {
       clSVMFree((*ocl_runtime_->Context())(), it->second->host_ptr_);
@@ -295,7 +309,11 @@ void *OpenCLAllocator::MapBuffer(void *host_ptr, int flags, void *command_queue,
         MS_LOG(ERROR) << "Map buffer failed, can not found buffer :" << host_ptr;
         return nullptr;
       }
-      ocl_runtime_->MapBuffer(host_ptr, flags, it->second->size_, static_cast<cl::CommandQueue *>(command_queue), sync);
+      int ret = ocl_runtime_->MapBuffer(host_ptr, flags, it->second->size_,
+                                        static_cast<cl::CommandQueue *>(command_queue), sync);
+      if (ret != RET_OK) {
+        MS_LOG(WARNING) << "MapBuffer failed.";
+      }
     }
     return host_ptr;
   }
@@ -313,14 +331,16 @@ void *OpenCLAllocator::MapBuffer(void *host_ptr, int flags, void *command_queue,
     return host_ptr;
   }
   MemBuf *mem_buf = it->second;
-  void *new_host_ptr{nullptr};
+  MS_ASSERT(mem_buf);
+  void *new_host_ptr;
   if (mem_buf->img_size.empty()) {
     cl::Buffer *buffer = static_cast<cl::Buffer *>(mem_buf->device_ptr_);
+    MS_ASSERT(buffer);
     new_host_ptr = ocl_runtime_->MapBuffer(*buffer, flags, mem_buf->size_, nullptr, sync);
   } else {
-    cl::ImageFormat image_format(CL_RGBA, mem_buf->img_size[2]);
     std::vector<size_t> region{mem_buf->img_size[0], mem_buf->img_size[1], 1};
     cl::Image2D *image = static_cast<cl::Image2D *>(mem_buf->image_ptr_);
+    MS_ASSERT(image);
     new_host_ptr = ocl_runtime_->MapBuffer(*image, 0, CL_MAP_READ | CL_MAP_WRITE, region);
   }
   if (new_host_ptr == nullptr) {
@@ -373,6 +393,7 @@ MemType OpenCLAllocator::GetMemType(void *host_ptr) {
     return mem_type;
   }
   MemBuf *mem_buf = it->second;
+  MS_ASSERT(mem_buf);
   if (mem_buf->img_size.empty()) {
     mem_type = MemType::BUF;
   } else {
@@ -383,6 +404,7 @@ MemType OpenCLAllocator::GetMemType(void *host_ptr) {
 }
 
 int OpenCLAllocator::GetImageSize(void *host_ptr, std::vector<size_t> *img_size) {
+  MS_ASSERT(img_size);
   Lock();
   auto it = allocated_list_.find(host_ptr);
   if (it == allocated_list_.end()) {
@@ -391,6 +413,7 @@ int OpenCLAllocator::GetImageSize(void *host_ptr, std::vector<size_t> *img_size)
     return RET_OK;
   }
   MemBuf *mem_buf = it->second;
+  MS_ASSERT(mem_buf);
   if (!mem_buf->img_size.empty()) {
     *img_size = mem_buf->img_size;
   }
diff --git a/mindspore/lite/src/runtime/opencl/opencl_allocator.h b/mindspore/lite/src/runtime/opencl/opencl_allocator.h
index b1ebafbeb1..f8a5f6e59a 100644
--- a/mindspore/lite/src/runtime/opencl/opencl_allocator.h
+++ b/mindspore/lite/src/runtime/opencl/opencl_allocator.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef MINDSPORE_LITE_SRC_OPENCL_ALLOCATOR_H_
-#define MINDSPORE_LITE_SRC_OPENCL_ALLOCATOR_H_
+#ifndef MINDSPORE_LITE_SRC_RUNTIME_OPENCL_ALLOCATOR_H_
+#define MINDSPORE_LITE_SRC_RUNTIME_OPENCL_ALLOCATOR_H_
 
 #include <memory>
 #include <string>
@@ -29,17 +29,6 @@
 
 namespace mindspore::lite::opencl {
 
-#define MS_HOST_BUFFER 0
-#define MS_CL_BUFFER (1 << 1)
-#define MS_CL_IMAGE2D (1 << 2)
-typedef int32_t OpenCLMemoryType;
-
-struct OpenclMemory {
-  void *host_ptr{nullptr};
-  void *device_ptr{nullptr};
-  OpenCLMemoryType mem_type{MS_HOST_BUFFER | MS_CL_BUFFER};
-};
-
 class OpenCLRuntime;
 enum class MemType : char { BUF, IMG };
 
@@ -95,4 +84,4 @@ class OpenCLAllocator : public Allocator {
 
 }  // namespace mindspore::lite::opencl
 
-#endif  // MINDSPORE_LITE_SRC_OPENCL_ALLOCATOR_H_
+#endif  // MINDSPORE_LITE_SRC_RUNTIME_OPENCL_ALLOCATOR_H_
diff --git a/mindspore/lite/src/runtime/opencl/opencl_executor.cc b/mindspore/lite/src/runtime/opencl/opencl_executor.cc
index 5110067d5f..67e5fbb979 100644
--- a/mindspore/lite/src/runtime/opencl/opencl_executor.cc
+++ b/mindspore/lite/src/runtime/opencl/opencl_executor.cc
@@ -21,14 +21,13 @@
 
 namespace mindspore::lite::opencl {
 
-int OpenCLExecutor::Prepare(const std::vector<kernel::LiteKernel *> &kernels) { return RET_OK; }
-
 int OpenCLExecutor::Run(std::vector<Tensor *> &inputs, std::vector<Tensor *> &outputs,
                         std::vector<kernel::LiteKernel *> &kernels, Allocator *allocator, const KernelCallBack &before,
                         const KernelCallBack &after) {
+  int ret;
   kernel::LiteKernelUtil::InitTensorRefCount(kernels);
   for (auto *kernel : kernels) {
-    MS_ASSERT(nullptr != kernel);
+    MS_ASSERT(kernel);
     CallBackParam callbackParam;
     callbackParam.node_name = kernel->name();
 
@@ -41,19 +40,27 @@ int OpenCLExecutor::Run(std::vector<Tensor *> &inputs, std::vector<Tensor *> &ou
     auto cur_outputs = kernel->out_tensors();
     for (auto i = 0; i < cur_outputs.size(); ++i) {
       auto *output = cur_outputs.at(i);
-      MS_ASSERT(nullptr != output);
+      MS_ASSERT(output);
       if (op_kernel->GetMemType() == lite::opencl::MemType::IMG) {
         std::vector<size_t> img_size;
-        op_kernel->GetImageSize(i, &img_size);
+        ret = op_kernel->GetImageSize(i, &img_size);
+        if (ret != RET_OK) {
+          MS_LOG(ERROR) << "GetImageSize failed";
+          return ret;
+        }
         auto data_ptr = allocator_->Malloc(output->Size(), img_size);
         output->set_data(data_ptr);
       } else {
-        output->MallocData(allocator_);
+        ret = output->MallocData(allocator_);
+        if (ret != RET_OK) {
+          MS_LOG(ERROR) << "MallocData failed";
+          return ret;
+        }
       }
     }
 
-    auto ret = kernel->Run();
-    if (0 != ret) {
+    ret = kernel->Run();
+    if (ret != RET_OK) {
       MS_LOG(ERROR) << "run kernel failed, name: " << kernel->name();
       return ret;
     }
@@ -64,9 +71,9 @@ int OpenCLExecutor::Run(std::vector<Tensor *> &inputs, std::vector<Tensor *> &ou
       }
     }
     for (auto input_kernel : kernel->in_kernels()) {
-      MS_ASSERT(nullptr != input_kernel);
+      MS_ASSERT(input_kernel);
       ret = input_kernel->DecOutTensorRefCount();
-      if (0 != ret) {
+      if (ret != RET_OK) {
         MS_LOG(WARNING) << "DecOutTensorRefCount for kernel" << kernel->name() << " failed";
       }
     }
diff --git a/mindspore/lite/src/runtime/opencl/opencl_executor.h b/mindspore/lite/src/runtime/opencl/opencl_executor.h
index 58d4e06733..fcf692f19b 100644
--- a/mindspore/lite/src/runtime/opencl/opencl_executor.h
+++ b/mindspore/lite/src/runtime/opencl/opencl_executor.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef MINDSPORE_LITE_SRC_OPENCL_EXECUTOR_H_
-#define MINDSPORE_LITE_SRC_OPENCL_EXECUTOR_H_
+#ifndef MINDSPORE_LITE_SRC_RUNTIME_OPENCL_EXECUTOR_H_
+#define MINDSPORE_LITE_SRC_RUNTIME_OPENCL_EXECUTOR_H_
 
 #include <vector>
 #include "src/runtime/opencl/opencl_runtime.h"
@@ -29,7 +29,7 @@ class OpenCLExecutor : public Executor {
  public:
   OpenCLExecutor() : Executor() { allocator_ = ocl_runtime.GetInstance()->GetAllocator(); }
 
-  int Prepare(const std::vector<kernel::LiteKernel *> &kernels) override;
+  int Prepare(const std::vector<kernel::LiteKernel *> &kernels) override { return RET_OK; }
 
   int Run(std::vector<Tensor *> &inputs, std::vector<Tensor *> &outputs, std::vector<kernel::LiteKernel *> &kernels,
           Allocator *allocator = nullptr, const KernelCallBack &before = nullptr,
diff --git a/mindspore/lite/src/runtime/opencl/opencl_runtime.cc b/mindspore/lite/src/runtime/opencl/opencl_runtime.cc
index 70137d416d..881005522c 100644
--- a/mindspore/lite/src/runtime/opencl/opencl_runtime.cc
+++ b/mindspore/lite/src/runtime/opencl/opencl_runtime.cc
@@ -100,8 +100,14 @@ int OpenCLRuntime::Init() {
   std::vector<cl::Device> devices;
   for (auto it = platforms.begin(); it != platforms.end(); ++it) {
     std::string platform_name;
-    it->getInfo(CL_PLATFORM_NAME, &platform_name);
-    it->getDevices(CL_DEVICE_TYPE_GPU, &devices);
+    ret = it->getInfo(CL_PLATFORM_NAME, &platform_name);
+    if (ret != CL_SUCCESS) {
+      MS_LOG(WARNING) << CLErrorCode(ret);
+    }
+    ret = it->getDevices(CL_DEVICE_TYPE_GPU, &devices);
+    if (ret != CL_SUCCESS) {
+      MS_LOG(WARNING) << CLErrorCode(ret);
+    }
     MS_LOG(INFO) << "Platform (" << platform_name << ") has " << devices.size() << " GPUs";
 
     if (devices.size() > 0) {
@@ -178,9 +184,18 @@ int OpenCLRuntime::Init() {
   }
 
   // get cache size, compute units and frequency.
-  device_->getInfo(CL_DEVICE_GLOBAL_MEM_CACHE_SIZE, &global_memery_cachesize_);
-  device_->getInfo(CL_DEVICE_MAX_COMPUTE_UNITS, &compute_units_);
-  device_->getInfo(CL_DEVICE_MAX_CLOCK_FREQUENCY, &max_freq_);
+  ret = device_->getInfo(CL_DEVICE_GLOBAL_MEM_CACHE_SIZE, &global_memery_cachesize_);
+  if (ret != CL_SUCCESS) {
+    MS_LOG(WARNING) << CLErrorCode(ret);
+  }
+  ret = device_->getInfo(CL_DEVICE_MAX_COMPUTE_UNITS, &compute_units_);
+  if (ret != CL_SUCCESS) {
+    MS_LOG(WARNING) << CLErrorCode(ret);
+  }
+  ret = device_->getInfo(CL_DEVICE_MAX_CLOCK_FREQUENCY, &max_freq_);
+  if (ret != CL_SUCCESS) {
+    MS_LOG(WARNING) << CLErrorCode(ret);
+  }
   cl_device_fp_config fp_config;
   auto success = device_->getInfo(CL_DEVICE_HALF_FP_CONFIG, &fp_config);
   support_fp16_ = CL_SUCCESS == success && fp_config > 0;
@@ -281,7 +296,9 @@ uint32_t OpenCLRuntime::DeviceMaxFreq() const { return max_freq_; }
 uint64_t OpenCLRuntime::GetMaxWorkGroupSize(const cl::Kernel &kernel) {
   uint64_t max_workgroup_size = 0;
   int ret = kernel.getWorkGroupInfo(*device_, CL_KERNEL_WORK_GROUP_SIZE, &max_workgroup_size);
-  if (ret != 0) max_workgroup_size = 0;
+  if (ret != CL_SUCCESS) {
+    max_workgroup_size = 0;
+  }
   return max_workgroup_size;
 }
 
@@ -421,7 +438,10 @@ int OpenCLRuntime::RunKernel(const cl::Kernel &kernel, const std::vector<size_t>
   static int cnt = 0;
   const int flush_period = 10;
   if (cnt % flush_period == 0) {
-    command_queue->flush();
+    auto flush_ret = command_queue->flush();
+    if (flush_ret != CL_SUCCESS) {
+      MS_LOG(WARNING) << "CL Flush failed:" << CLErrorCode(ret);
+    }
   }
   cnt++;
   MS_LOG(DEBUG) << "RunKernel success!";
@@ -454,7 +474,10 @@ int OpenCLRuntime::RunKernel(const cl::Kernel &kernel, const cl::NDRange &global
   static int cnt = 0;
   const int flush_period = 10;
   if (cnt % flush_period == 0) {
-    command_queue->flush();
+    auto flush_ret = command_queue->flush();
+    if (flush_ret != CL_SUCCESS) {
+      MS_LOG(WARNING) << "CL Flush failed:" << CLErrorCode(ret);
+    }
   }
   cnt++;
   MS_LOG(DEBUG) << "RunKernel success!";