diff --git a/mindspore/lite/schema/ops.fbs b/mindspore/lite/schema/ops.fbs
index 0c1fa797bf..ca11616e53 100644
--- a/mindspore/lite/schema/ops.fbs
+++ b/mindspore/lite/schema/ops.fbs
@@ -940,7 +940,7 @@ table Unique {
 }
 
 table Unstack {
-    num: int;
+    num: int;   // deprecated
     axis: int;
 }
 
diff --git a/mindspore/lite/src/ops/populate/unstack_populate.cc b/mindspore/lite/src/ops/populate/unstack_populate.cc
index 09f9768d30..c2b7647003 100644
--- a/mindspore/lite/src/ops/populate/unstack_populate.cc
+++ b/mindspore/lite/src/ops/populate/unstack_populate.cc
@@ -31,7 +31,6 @@ OpParameter *PopulateUnstackParameter(const mindspore::lite::PrimitiveC *primiti
   memset(unstack_param, 0, sizeof(UnstackParameter));
   auto param = reinterpret_cast<mindspore::lite::Unstack *>(const_cast<mindspore::lite::PrimitiveC *>(primitive));
   unstack_param->op_parameter_.type_ = primitive->Type();
-  unstack_param->num_ = param->GetNum();
   unstack_param->axis_ = param->GetAxis();
   return reinterpret_cast<OpParameter *>(unstack_param);
 }
diff --git a/mindspore/lite/src/ops/unstack.cc b/mindspore/lite/src/ops/unstack.cc
index 52deeafabb..7913476f25 100644
--- a/mindspore/lite/src/ops/unstack.cc
+++ b/mindspore/lite/src/ops/unstack.cc
@@ -22,15 +22,12 @@
 namespace mindspore {
 namespace lite {
 #ifdef PRIMITIVE_WRITEABLE
-int Unstack::GetNum() const { return this->primitive_->value.AsUnstack()->num; }
 int Unstack::GetAxis() const { return this->primitive_->value.AsUnstack()->axis; }
 
-void Unstack::SetNum(int num) { this->primitive_->value.AsUnstack()->num = num; }
 void Unstack::SetAxis(int axis) { this->primitive_->value.AsUnstack()->axis = axis; }
 
 #else
 
-int Unstack::GetNum() const { return this->primitive_->value_as_Unstack()->num(); }
 int Unstack::GetAxis() const { return this->primitive_->value_as_Unstack()->axis(); }
 int Unstack::UnPackToFlatBuilder(const schema::Primitive *primitive, flatbuffers::FlatBufferBuilder *fbb) {
   MS_ASSERT(nullptr != primitive);
diff --git a/mindspore/lite/src/ops/unstack.h b/mindspore/lite/src/ops/unstack.h
index b1e25f6a92..9dd73df784 100644
--- a/mindspore/lite/src/ops/unstack.h
+++ b/mindspore/lite/src/ops/unstack.h
@@ -32,13 +32,11 @@ class Unstack : public PrimitiveC {
 #ifdef PRIMITIVE_WRITEABLE
   MS_DECLARE_PARENT(Unstack, PrimitiveC);
   explicit Unstack(schema::PrimitiveT *primitive) : PrimitiveC(primitive) {}
-  void SetNum(int num);
   void SetAxis(int axis);
 #else
   int UnPackToFlatBuilder(const schema::Primitive *primitive, flatbuffers::FlatBufferBuilder *fbb) override;
 #endif
   int InferShape(std::vector<lite::Tensor *> inputs_, std::vector<lite::Tensor *> outputs_) override;
-  int GetNum() const;
   int GetAxis() const;
 };
 }  // namespace lite
diff --git a/mindspore/lite/src/runtime/kernel/arm/fp32/unstack_fp32.cc b/mindspore/lite/src/runtime/kernel/arm/fp32/unstack_fp32.cc
index 87535715c3..97d8f03f80 100644
--- a/mindspore/lite/src/runtime/kernel/arm/fp32/unstack_fp32.cc
+++ b/mindspore/lite/src/runtime/kernel/arm/fp32/unstack_fp32.cc
@@ -42,6 +42,7 @@ int UnstackCPUKernel::ReSize() {
   if (para->axis_ < 0) {
     para->axis_ += shape_size;
   }
+
   for (size_t i = 0; i < shape_size; i++) {
     if (static_cast<int>(i) < para->axis_) {
       para->pre_dims_ *= input->DimensionSize(i);
@@ -71,7 +72,9 @@ int UnstackCPUKernel::Run() {
     output_addr_array_[i] = reinterpret_cast<float *>(out_tensors_.at(i)->MutableData());
   }
   MS_ASSERT(output_addr_array_);
-  Unistack(input, output_addr_array_, reinterpret_cast<UnstackParameter *>(op_parameter_));
+  auto para = reinterpret_cast<UnstackParameter *>(op_parameter_);
+  para->num_ = out_num;
+  Unistack(input, output_addr_array_, para);
   return RET_OK;
 }
 
diff --git a/mindspore/lite/tools/converter/parser/tflite/tflite_unstack_parser.cc b/mindspore/lite/tools/converter/parser/tflite/tflite_unstack_parser.cc
index 869e76bd73..7110da2adc 100644
--- a/mindspore/lite/tools/converter/parser/tflite/tflite_unstack_parser.cc
+++ b/mindspore/lite/tools/converter/parser/tflite/tflite_unstack_parser.cc
@@ -40,7 +40,6 @@ PrimitiveC *TfliteUnstackParser::ParseLitePrimitive(const std::unique_ptr<tflite
     MS_LOG(ERROR) << "get op unstack attr failed";
     return nullptr;
   }
-  attr->num = tflite_attr->num;
   attr->axis = tflite_attr->axis;
 
   primitive->value.type = schema::PrimitiveType_Unstack;