diff --git a/ge/graph/manager/graph_caching_allocator.cc b/ge/graph/manager/graph_caching_allocator.cc
index bfef4001..dd46e670 100644
--- a/ge/graph/manager/graph_caching_allocator.cc
+++ b/ge/graph/manager/graph_caching_allocator.cc
@@ -28,10 +28,9 @@ const size_t bin_ranges[kNumBins] = {kRoundBlockSize * kKByteSize,
                                      kBinSizeUnit8 * kMByteSize,
                                      kBinSizeUnit32 * kMByteSize,
                                      kBinSizeUnit128 * kMByteSize,
-                                     kGByteSize,
-                                     kBinSizeUnit4 * kGByteSize,
-                                     kBinSizeUnit16 * kGByteSize,
-                                     kBinSizeUnit26 * kGByteSize};
+                                     kBinSizeUnit256 * kMByteSize,
+                                     kBinSizeUnit512 * kMByteSize,
+                                     kGByteSize};
 
 static bool BlockComparator(const Block *left, const Block *right) {
   if (left->size != right->size) {
@@ -63,7 +62,10 @@ size_t GetBinIndex(size_t size) {
 
 size_t GetAllocationSize(size_t size) {
   size_t index = GetBinIndex(size);
-  return bin_ranges[index];
+  if (bin_ranges[index] >= size) {
+    return bin_ranges[index];
+  }
+  return kGByteSize * ((size + kGByteSize - 1) / kGByteSize);
 }
 
 ///
diff --git a/ge/graph/manager/graph_caching_allocator.h b/ge/graph/manager/graph_caching_allocator.h
index e024d5cd..42d0952d 100644
--- a/ge/graph/manager/graph_caching_allocator.h
+++ b/ge/graph/manager/graph_caching_allocator.h
@@ -36,17 +36,17 @@ namespace ge {
 constexpr size_t kRoundBlockSize = 512;         // all block sizes are rounded to at least 512 bytes
 constexpr size_t kBinSizeUnit4 = 4;
 constexpr size_t kBinSizeUnit8 = 8;
-constexpr size_t kBinSizeUnit16 = 16;
-constexpr size_t kBinSizeUnit26 = 26;
 constexpr size_t kBinSizeUnit32 = 32;
 constexpr size_t kBinSizeUnit128 = 128;
+constexpr size_t kBinSizeUnit256 = 256;
+constexpr size_t kBinSizeUnit512 = 512;
 
-constexpr double kSplitThreshold = 0.75;         // split when malloc size <= small block size * kSpliThreshold
+constexpr double kSplitThreshold = 0.5;         // split when malloc size <= small block size * kSpliThreshold
 constexpr size_t kKByteSize = 1024;
 constexpr size_t kMByteSize = 1048576;   // 1024 * 1024
 constexpr size_t kGByteSize = 1073741824;   // 1024 * 1024 * 1024
 
-static const uint32_t kNumBins = 8;
+static const uint32_t kNumBins = 7;
 
 class MemoryAllocator;
 
diff --git a/ge/hybrid/executor/worker/execution_engine.cc b/ge/hybrid/executor/worker/execution_engine.cc
index 7f4fa78c..bd53bec4 100755
--- a/ge/hybrid/executor/worker/execution_engine.cc
+++ b/ge/hybrid/executor/worker/execution_engine.cc
@@ -322,7 +322,8 @@ Status NodeDoneCallback::OnNodeDone() {
     GE_CHK_STATUS_RET(ProfilingReport(), "Report node[%s] to profiling failed.",
                       node_item.NodeName().c_str());
   }
-
+  // release workspace
+  context_->ReleaseWorkspace();
   // release inputs
   for (int i = 0; i < context_->NumInputs(); ++i) {
     context_->ReleaseInput(i);
diff --git a/ge/hybrid/node_executor/task_context.cc b/ge/hybrid/node_executor/task_context.cc
index e3cf5ae1..085970e0 100644
--- a/ge/hybrid/node_executor/task_context.cc
+++ b/ge/hybrid/node_executor/task_context.cc
@@ -36,10 +36,6 @@ TaskContext::TaskContext(GraphExecutionContext *execution_context,
 
 TaskContext::~TaskContext() {
   GELOGD("[%s] TaskContext destroyed.", node_item_->NodeName().c_str());
-  for (auto ws_addr : workspaces_) {
-    execution_context_->allocator->Deallocate(ws_addr);
-  }
-
   // release output
   for (int i = 0; i < NumOutputs(); ++i) {
     auto output_tensor = MutableOutput(i);
@@ -49,6 +45,13 @@ TaskContext::~TaskContext() {
   }
 }
 
+void TaskContext::ReleaseWorkspace() {
+  GELOGD("[%s] Start ReleaseWorkspace.", node_item_->NodeName().c_str());
+  for (auto ws_addr : workspaces_) {
+    execution_context_->allocator->Deallocate(ws_addr);
+  }
+}
+
 std::unique_ptr<TaskContext> TaskContext::Create(NodeState *node_state,
                                                  GraphExecutionContext *execution_context,
                                                  SubgraphContext *subgraph_context) {
diff --git a/ge/hybrid/node_executor/task_context.h b/ge/hybrid/node_executor/task_context.h
index dc4ff058..6bdf8014 100644
--- a/ge/hybrid/node_executor/task_context.h
+++ b/ge/hybrid/node_executor/task_context.h
@@ -55,6 +55,7 @@ class TaskContext {
   GeTensorDescPtr MutableOutputDesc(int index) const;
   void ReleaseInputsAndOutputs();
   bool NeedCallback();
+  void ReleaseWorkspace();
   void ReleaseInput(int index);
   const TensorValue *GetInput(int index) const;
   const TensorValue *GetOutput(int index) const;