diff --git a/mindspore/lite/src/kernel_registry.h b/mindspore/lite/src/kernel_registry.h
index 552f6bec46..d0fc1911f5 100644
--- a/mindspore/lite/src/kernel_registry.h
+++ b/mindspore/lite/src/kernel_registry.h
@@ -36,13 +36,11 @@ class KernelRegistry {
 
   static KernelRegistry *GetInstance();
   int Init();
-  void FreeCreatorArray();
   virtual kernel::KernelCreator GetCreator(const kernel::KernelKey &desc);
   const kernel::KernelCreator *GetCreatorArrays();
-  int GetCreatorFuncIndex(const kernel::KernelKey desc);
-  void RegKernel(const kernel::KernelKey desc, kernel::KernelCreator creator);
-  void RegKernel(const kernel::KERNEL_ARCH arch, const TypeId data_type, const schema::PrimitiveType type,
-                 kernel::KernelCreator creator);
+  int GetCreatorFuncIndex(kernel::KernelKey desc);
+  void RegKernel(kernel::KernelKey desc, kernel::KernelCreator creator);
+  void RegKernel(kernel::KERNEL_ARCH arch, TypeId data_type, schema::PrimitiveType type, kernel::KernelCreator creator);
   bool Merge(const std::unordered_map<kernel::KernelKey, kernel::KernelCreator> &newCreators);
   kernel::LiteKernel *GetKernel(const std::vector<Tensor *> &in_tensors, const std::vector<Tensor *> &out_tensors,
                                 const PrimitiveC *primitive, const InnerContext *ctx, const kernel::KernelKey &key);
@@ -61,6 +59,7 @@ class KernelRegistrar {
   KernelRegistrar(const kernel::KernelKey &desc, kernel::KernelCreator creator) {
     KernelRegistry::GetInstance()->RegKernel(desc, creator);
   }
+  ~KernelRegistrar() = default;
 
   KernelRegistrar(const kernel::KERNEL_ARCH arch, const TypeId data_type, const schema::PrimitiveType op_type,
                   kernel::KernelCreator creator) {
diff --git a/mindspore/lite/src/model_common.cc b/mindspore/lite/src/model_common.cc
index 87428952cc..eae287a027 100644
--- a/mindspore/lite/src/model_common.cc
+++ b/mindspore/lite/src/model_common.cc
@@ -23,6 +23,7 @@ int ConvertSubGraph(const schema::SubGraph &sub_graph, Model *model) {
     MS_LOG(ERROR) << "new subGraph fail!";
     return RET_ERROR;
   }
+  MS_ASSERT(sub_graph.name() != nullptr);
   subgraph->name_ = sub_graph.name()->c_str();
   MS_ASSERT(sub_graph.inputIndices() != nullptr);
   auto in_count = sub_graph.inputIndices()->size();
@@ -68,6 +69,7 @@ const void *GetMetaGraphByVerison(const char *buf, const int &schema_version) {
 }
 
 int GenerateModelByVersion(const void *meta_graph, Model *model, const int &schema_version) {
+  MS_ASSERT(meta_graph != nullptr);
   MS_ASSERT(model != nullptr);
   int status = RET_ERROR;
   if (schema_version == SCHEMA_VERSION::SCHEMA_CUR) {
diff --git a/mindspore/lite/src/param_value_lite.h b/mindspore/lite/src/param_value_lite.h
index 338a046908..e3f95a93df 100644
--- a/mindspore/lite/src/param_value_lite.h
+++ b/mindspore/lite/src/param_value_lite.h
@@ -27,7 +27,7 @@ namespace mindspore {
 class ParamValueLite : public Value {
  public:
   ParamValueLite() : tensor_addr_(nullptr), tensor_size_(0) {}
-  virtual ~ParamValueLite() {
+  ~ParamValueLite() override {
     if (tensor_addr_ != nullptr) {
       auto tensor_mem = reinterpret_cast<char *>(tensor_addr_);
       delete[](tensor_mem);
diff --git a/mindspore/lite/src/runtime/kernel/arm/base/dequant.h b/mindspore/lite/src/runtime/kernel/arm/base/dequant.h
index 1363fb0515..7953b1ce06 100644
--- a/mindspore/lite/src/runtime/kernel/arm/base/dequant.h
+++ b/mindspore/lite/src/runtime/kernel/arm/base/dequant.h
@@ -58,7 +58,7 @@ class DequantUtil {
         }
       }
     } else if (input_tensor->GetQuantParams().size() != kPerTensor) {
-      size_t channels = static_cast<size_t>(input_tensor->Batch());
+      auto channels = static_cast<size_t>(input_tensor->Batch());
       if (input_tensor->GetQuantParams().size() != channels) {
         MS_LOG(ERROR) << "Quant param not equal channel num " << input_tensor->GetQuantParams().size() << channels;
         free(dequant_datas);
@@ -136,6 +136,10 @@ class DequantUtil {
 
   template <typename T1, typename T2>
   static void UnPackUtil(const schema::Tensor *input_tensor, int origin_bit, void *unpack_int_data) {
+    if (input_tensor == nullptr || input_tensor->data() == nullptr) {
+      MS_LOG(ERROR) << "tensor data is null";
+      return;
+    }
     auto weight_data = input_tensor->data()->data();
     int pack_size =
       input_tensor->dataType() == kNumberTypeInt8 ? input_tensor->data()->size() : input_tensor->data()->size() / 2;
diff --git a/mindspore/lite/src/runtime/thread_pool.c b/mindspore/lite/src/runtime/thread_pool.c
index 9e7ed80c0e..90c326d2ac 100644
--- a/mindspore/lite/src/runtime/thread_pool.c
+++ b/mindspore/lite/src/runtime/thread_pool.c
@@ -848,6 +848,7 @@ ThreadPool *CreateThreadPool(int thread_num, int mode) {
     if (thread_pool->thread_list == NULL) {
       LOG_ERROR("create thread list failed");
       DestroyThreadPool(thread_pool);
+      thread_pool = NULL;
       return NULL;
     }
     thread_pool->thread_list->head = NULL;
diff --git a/mindspore/lite/tools/anf_importer/import_from_protobuf.cc b/mindspore/lite/tools/anf_importer/import_from_protobuf.cc
index 6ed145ac60..1104c66913 100644
--- a/mindspore/lite/tools/anf_importer/import_from_protobuf.cc
+++ b/mindspore/lite/tools/anf_importer/import_from_protobuf.cc
@@ -15,11 +15,7 @@
  */
 
 #include "tools/anf_importer/import_from_protobuf.h"
-
-#include <fcntl.h>
 #include <unistd.h>
-
-#include <fstream>
 #include <map>
 #include <memory>
 #include <stack>
@@ -243,7 +239,7 @@ int AnfImporterFromProtobuf::BuildParameterForFuncGraph(const ParameterPtr &node
   node->set_abstract(abstract_tensor);
 
   if (default_para_map_.find(value_proto.name()) != default_para_map_.end()) {
-    Tensor *tensor_info = new Tensor(kDefaultValueSwitchMap[tensor_typeproto.elem_type()], shape);
+    auto *tensor_info = new Tensor(kDefaultValueSwitchMap[tensor_typeproto.elem_type()], shape);
     if (tensor_info == nullptr) {
       return RET_MEMORY_FAILED;
     }
@@ -435,7 +431,7 @@ bool AnfImporterFromProtobuf::GetAttrValueForCNode(const PrimitivePtr &prim, con
   }
   if (kParseTypeSwitchMap[type] == FORM_PARSE_SCALAR) {
     if (kv.size() == 1) {
-      std::unordered_map<std::string, ValuePtr>::iterator iter = kv.begin();
+      auto iter = kv.begin();
       prim->AddAttr(attr_name, iter->second);
     } else {
       auto res = ParserScalarAttrValue(ref_attr_name, kv);
@@ -459,7 +455,7 @@ bool AnfImporterFromProtobuf::ObtainValueNodeInTensorForm(const std::string &val
   param_value->set_tensor_shape(shape_vector);
   param_value->set_tensor_type(kDefaultValueSwitchMap[attr_tensor_type]);
   const std::string &tensor_buf = attr_tensor.raw_data();
-  auto tensor_data = new (std::nothrow) char[tensor_buf.size()];
+  auto tensor_data = new (std::nothrow) char[tensor_buf.size() + 1];
   if (tensor_data == nullptr) {
     MS_LOG(ERROR) << "Tensor_data is nullptr";
     return false;
@@ -648,14 +644,14 @@ CNodePtr AnfImporterFromProtobuf::BuildCNodeForFuncGraph(const FuncGraphPtr &out
     MS_LOG(ERROR) << "funcgraph new cnode failed";
     return nullptr;
   }
-  if (0 == kv.size()) {
+  if (kv.empty()) {
     AbstractBasePtrList elem;
     for (size_t index = 1; index < cnode_ptr->inputs().size(); ++index) {
       elem.push_back(cnode_ptr->input(index)->abstract());
     }
     cnode_ptr->set_abstract(std::make_shared<abstract::AbstractTuple>(elem));
   } else if (1 == kv.size()) {
-    std::unordered_map<std::string, abstract::AbstractTensorPtr>::iterator iter = kv.begin();
+    auto iter = kv.begin();
     cnode_ptr->set_abstract(iter->second);
   } else {
     auto abstract = ParserAttrShape(shape_ref_attr_name, kv);
diff --git a/mindspore/lite/tools/anf_importer/import_from_protobuf.h b/mindspore/lite/tools/anf_importer/import_from_protobuf.h
index e1417f7c83..3ca2a46cb5 100644
--- a/mindspore/lite/tools/anf_importer/import_from_protobuf.h
+++ b/mindspore/lite/tools/anf_importer/import_from_protobuf.h
@@ -57,17 +57,17 @@ class AnfImporterFromProtobuf : public AnfImporter {
                                   const schema::QuantType &quantType);
   bool BuildReturnForFuncGraph(const FuncGraphPtr &outputFuncGraph, const onnx::GraphProto &importProto,
                                const CNodePtr &cnode_ptr);
-  bool GetAttrValueForCNode(const PrimitivePtr &prim, const onnx::AttributeProto &attr_proto);
-  bool ObtainCNodeAttrInTypeForm(const PrimitivePtr &prim, const std::string &attr_name,
-                                 const onnx::TensorProto &attr_tensor);
-  ValuePtr ObtainCNodeAttrInScalarForm(const onnx::TensorProto &attr_tensor);
-  bool ObtainCNodeAttrInTensorForm(const PrimitivePtr &prim, const std::string &attr_name,
-                                   const onnx::TensorProto &attr_tensor);
+  static bool GetAttrValueForCNode(const PrimitivePtr &prim, const onnx::AttributeProto &attr_proto);
+  static bool ObtainCNodeAttrInTypeForm(const PrimitivePtr &prim, const std::string &attr_name,
+                                        const onnx::TensorProto &attr_tensor);
+  static ValuePtr ObtainCNodeAttrInScalarForm(const onnx::TensorProto &attr_tensor);
+  static bool ObtainCNodeAttrInTensorForm(const PrimitivePtr &prim, const std::string &attr_name,
+                                          const onnx::TensorProto &attr_tensor);
   bool BuildValueNodeForFuncGraph(const onnx::NodeProto &node_proto);
   bool ObtainValueNodeInTensorForm(const string &value_node_name, const onnx::TensorProto &attr_tensor);
   bool GetAttrValueForValueNode(const std::string &value_node_name, const onnx::AttributeProto &attr_proto);
   bool ObtainValueNodeInTypeForm(const string &value_node_name, const onnx::TensorProto &attr_tensor);
-  std::unordered_map<std::string, abstract::AbstractTensorPtr> GetAbstractForCNode(
+  static std::unordered_map<std::string, abstract::AbstractTensorPtr> GetAbstractForCNode(
     const onnx::AttributeProto &attr_proto);
 
  private:
diff --git a/mindspore/lite/tools/converter/legacy_optimizer/fusion/mul_add_fusion_pass.cc b/mindspore/lite/tools/converter/legacy_optimizer/fusion/mul_add_fusion_pass.cc
index 3f4b746a53..29860b45eb 100644
--- a/mindspore/lite/tools/converter/legacy_optimizer/fusion/mul_add_fusion_pass.cc
+++ b/mindspore/lite/tools/converter/legacy_optimizer/fusion/mul_add_fusion_pass.cc
@@ -147,7 +147,6 @@ STATUS MulAddFusionPass::AddNewScaleNode(MetaGraphT *graph, const std::unique_pt
   scaleParam->axis = 0 - shape_size;
   mulNode->inputIndex.push_back(addBiasIndex);
   MS_ASSERT(addNode->primitive != nullptr);
-  MS_ASSERT(addNode->primitive->value != nullptr);
   MS_ASSERT(addNode->primitive->value.AsAdd() != nullptr);
   auto activationType = addNode->primitive->value.AsAdd()->activationType;
   if (activationType == ActivationType_RELU || activationType == ActivationType_RELU6 ||
@@ -163,7 +162,6 @@ STATUS MulAddFusionPass::AddNewScaleNode(MetaGraphT *graph, const std::unique_pt
     // repace addnode as activation
     std::unique_ptr<ActivationT> activationParam(new ActivationT());
     MS_ASSERT(addNode->primitive != nullptr);
-    MS_ASSERT(addNode->primitive->value != nullptr);
     MS_ASSERT(addNode->primitive->value.AsAdd() != nullptr);
     activationParam->type = addNode->primitive->value.AsAdd()->activationType;
     addNode->primitive->value.type = schema::PrimitiveType_Activation;
diff --git a/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.cc b/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.cc
index e7a051f98e..59058ae13a 100644
--- a/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.cc
+++ b/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.cc
@@ -19,8 +19,7 @@
 #include <memory>
 #include <vector>
 
-namespace mindspore {
-namespace lite {
+namespace mindspore::lite {
 constexpr int32_t kSingleGroup = 1;
 bool OnnxConvParser::ParseGroupConvolution(const std::unique_ptr<schema::Conv2DT> &attr, schema::CNodeT *op) {
   MS_LOG(DEBUG) << "onnx DepthwiseConvParser";
@@ -140,6 +139,7 @@ STATUS OnnxConvParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::Nod
     }
     std::vector<int> weight_shape;
     auto size = (*nodeIter).dims_size();
+    weight_shape.reserve(size);
     for (int i = 0; i < size; ++i) {
       weight_shape.emplace_back((*nodeIter).dims(i));
     }
@@ -157,7 +157,6 @@ STATUS OnnxConvParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::Nod
     auto iter = std::find_if((*nodeIter).attribute().begin(), (*nodeIter).attribute().end(),
                              [](const onnx::AttributeProto &attr) { return attr.name() == "shape"; });
     if (iter != (*nodeIter).attribute().end()) {
-      MS_ASSERT(iter->ints() != nullptr);
       MS_ASSERT(iter->ints().begin() != nullptr);
       MS_ASSERT(iter->ints().end() != nullptr);
       dims.insert(dims.begin(), iter->ints().begin(), iter->ints().end());
@@ -188,5 +187,4 @@ OnnxNodeRegistrar g_onnxConvParser("Conv", new OnnxConvParser());
 OnnxNodeRegistrar g_onnxInt8ConvParser("Int8Conv", new OnnxConvParser());
 OnnxNodeRegistrar g_onnxConvReluParser("ConvRelu", new OnnxConvParser());
 OnnxNodeRegistrar g_onnxInt8ConvReluParser("Int8ConvRelu", new OnnxConvParser());
-}  // namespace lite
-}  // namespace mindspore
+}  // namespace mindspore::lite
diff --git a/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.h b/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.h
index ab2e8cf5d0..0162c6ffe4 100644
--- a/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.h
+++ b/mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.h
@@ -31,7 +31,7 @@ class OnnxConvParser : public OnnxNodeParser {
   STATUS Parse(const onnx::GraphProto &onnx_graph, const onnx::NodeProto &onnx_node, schema::CNodeT *op) override;
 
  private:
-  bool ParseGroupConvolution(const std::unique_ptr<schema::Conv2DT> &attr, schema::CNodeT *op);
+  static bool ParseGroupConvolution(const std::unique_ptr<schema::Conv2DT> &attr, schema::CNodeT *op);
 };
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/tools/converter/parser/onnx/onnx_lp_norm_parser.cc b/mindspore/lite/tools/converter/parser/onnx/onnx_lp_norm_parser.cc
index 6835de0201..bddbfe9bdf 100644
--- a/mindspore/lite/tools/converter/parser/onnx/onnx_lp_norm_parser.cc
+++ b/mindspore/lite/tools/converter/parser/onnx/onnx_lp_norm_parser.cc
@@ -17,8 +17,7 @@
 #include "tools/converter/parser/onnx/onnx_lp_norm_parser.h"
 #include <memory>
 
-namespace mindspore {
-namespace lite {
+namespace mindspore::lite {
 STATUS OnnxLpNormParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::NodeProto &onnx_node,
                                schema::CNodeT *op) {
   MS_LOG(DEBUG) << "onnx LpNormParser";
@@ -38,13 +37,12 @@ STATUS OnnxLpNormParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::N
     return RET_NULL_PTR;
   }
 
-  auto onnx_node_attr = onnx_node.attribute();
-  for (int i = 0; i < onnx_node_attr.size(); ++i) {
-    MS_ASSERT(onnx_node_attr.at(i) != nullptr);
-    if (onnx_node_attr.at(i).name() == "axis") {
-      attr->axis = onnx_node_attr.at(i).i();
-    } else if (onnx_node_attr.at(i).name() == "p") {
-      attr->p = onnx_node_attr.at(i).i();
+  for (const auto &onnx_node_attr : onnx_node.attribute()) {
+    const auto &attribute_name = onnx_node_attr.name();
+    if (attribute_name == "axis") {
+      attr->axis = onnx_node_attr.i();
+    } else if (attribute_name == "p") {
+      attr->p = onnx_node_attr.i();
     }
   }
 
@@ -54,5 +52,4 @@ STATUS OnnxLpNormParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::N
 }
 
 OnnxNodeRegistrar g_onnxLpNormParser("LpNormalization", new OnnxLpNormParser());
-}  // namespace lite
-}  // namespace mindspore
+}  // namespace mindspore::lite
diff --git a/mindspore/lite/tools/converter/parser/onnx/onnx_lrn_parser.cc b/mindspore/lite/tools/converter/parser/onnx/onnx_lrn_parser.cc
index f27ae16415..267abfa8b8 100644
--- a/mindspore/lite/tools/converter/parser/onnx/onnx_lrn_parser.cc
+++ b/mindspore/lite/tools/converter/parser/onnx/onnx_lrn_parser.cc
@@ -17,8 +17,7 @@
 #include "tools/converter/parser/onnx/onnx_lrn_parser.h"
 #include <memory>
 
-namespace mindspore {
-namespace lite {
+namespace mindspore::lite {
 STATUS OnnxLrnParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::NodeProto &onnx_node, schema::CNodeT *op) {
   MS_LOG(DEBUG) << "onnx LrnParser";
   if (op == nullptr) {
@@ -37,18 +36,17 @@ STATUS OnnxLrnParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::Node
     return RET_NULL_PTR;
   }
 
-  auto onnx_node_attr = onnx_node.attribute();
   int32_t size = 0;
-  for (int i = 0; i < onnx_node_attr.size(); ++i) {
-    MS_ASSERT(onnx_node_attr.at(i) != nullptr);
-    if (onnx_node_attr.at(i).name() == "alpha") {
-      attr->alpha = onnx_node_attr.at(i).f();
-    } else if (onnx_node_attr.at(i).name() == "beta") {
-      attr->beta = onnx_node_attr.at(i).f();
-    } else if (onnx_node_attr.at(i).name() == "bias") {
-      attr->bias = onnx_node_attr.at(i).f();
-    } else if (onnx_node_attr.at(i).name() == "size") {
-      size = static_cast<int32_t>(onnx_node_attr.at(i).i());
+  for (const auto &onnx_node_attr : onnx_node.attribute()) {
+    const auto &attribute_name = onnx_node_attr.name();
+    if (attribute_name == "alpha") {
+      attr->alpha = onnx_node_attr.f();
+    } else if (attribute_name == "beta") {
+      attr->beta = onnx_node_attr.f();
+    } else if (attribute_name == "bias") {
+      attr->bias = onnx_node_attr.f();
+    } else if (attribute_name == "size") {
+      size = static_cast<int32_t>(onnx_node_attr.i());
       attr->depth_radius = size / 2;
     }
   }
@@ -66,5 +64,4 @@ STATUS OnnxLrnParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::Node
 
 OnnxNodeRegistrar g_onnxLrnxParser("Lrn", new OnnxLrnParser());
 OnnxNodeRegistrar g_onnxLRNxParser("LRN", new OnnxLrnParser());
-}  // namespace lite
-}  // namespace mindspore
+}  // namespace mindspore::lite
diff --git a/mindspore/lite/tools/converter/quantizer/post_training_quantizer.h b/mindspore/lite/tools/converter/quantizer/post_training_quantizer.h
index a96ecf49fc..baac54b342 100644
--- a/mindspore/lite/tools/converter/quantizer/post_training_quantizer.h
+++ b/mindspore/lite/tools/converter/quantizer/post_training_quantizer.h
@@ -192,22 +192,24 @@ class Calibrator {
 
   STATUS AddQuantizedOp(const CNodePtr &node);
 
-  STATUS RecordMaxValue(const std::vector<float> &data, const std::unique_ptr<DivergInfo> &diverg_info);
+  static STATUS RecordMaxValue(const std::vector<float> &data, const std::unique_ptr<DivergInfo> &diverg_info);
 
-  STATUS UpdateDivergInverval(std::unordered_map<std::string, std::vector<std::unique_ptr<DivergInfo>>> *diverg_info);
+  static STATUS UpdateDivergInverval(
+    std::unordered_map<std::string, std::vector<std::unique_ptr<DivergInfo>>> *diverg_info);
 
-  STATUS UpdateDataFrequency(const std::vector<float> &data, const std::unique_ptr<DivergInfo> &diverg_info);
+  static STATUS UpdateDataFrequency(const std::vector<float> &data, const std::unique_ptr<DivergInfo> &diverg_info);
   void Dump();
 
   STATUS ComputeThreshold();
 
-  std::unordered_map<CNodePtr, float> GetScale(
+  static std::unordered_map<CNodePtr, float> GetScale(
     std::unordered_map<std::string, std::unique_ptr<DivergInfo>> *diverg_info);
 
-  std::unordered_map<CNodePtr, int32_t> GetZeropoint(
+  static std::unordered_map<CNodePtr, int32_t> GetZeropoint(
     std::unordered_map<std::string, std::unique_ptr<DivergInfo>> *diverg_info);
 
-  std::map<CNodePtr, MaxMin> GetMinMax(std::unordered_map<std::string, std::unique_ptr<DivergInfo>> *diverg_info);
+  static std::map<CNodePtr, MaxMin> GetMinMax(
+    std::unordered_map<std::string, std::unique_ptr<DivergInfo>> *diverg_info);
 
   std::unordered_map<std::string, std::vector<std::unique_ptr<DivergInfo>>> *GetInputDivergInfo();
 
diff --git a/mindspore/lite/tools/optimizer/fusion/constant_folding_fusion.cc b/mindspore/lite/tools/optimizer/fusion/constant_folding_fusion.cc
index 6af61f5476..20f6c53ae3 100644
--- a/mindspore/lite/tools/optimizer/fusion/constant_folding_fusion.cc
+++ b/mindspore/lite/tools/optimizer/fusion/constant_folding_fusion.cc
@@ -110,8 +110,9 @@ ParameterPtr CreateNewParamter(const FuncGraphPtr &func_graph, Tensor *tensor) {
   parameter->set_default_param(param_value);
   return parameter;
 }
-kernel::LiteKernel *GetLiteKernel(std::vector<Tensor *> inputs, std::vector<Tensor *> outputs, OpParameter *parameter,
-                                  lite::InnerContext *context, mindspore::lite::PrimitiveC *primitive) {
+kernel::LiteKernel *GetLiteKernel(std::vector<Tensor *> inputs, const std::vector<Tensor *> &outputs,
+                                  OpParameter *parameter, lite::InnerContext *context,
+                                  mindspore::lite::PrimitiveC *primitive) {
   MS_ASSERT(nullptr != lite_primitive);
   auto data_type = inputs.front()->data_type();
   kernel::KernelKey desc{kernel::KERNEL_ARCH::kCPU, data_type, (schema::PrimitiveType)primitive->Type()};
@@ -163,15 +164,15 @@ lite::STATUS ReplaceCNode(const FuncGraphPtr &func_graph, const CNodePtr &any_no
 }  //  namespace
 void FreeTensors(std::vector<Tensor *> *input_tensor, std::vector<Tensor *> *output_tensor) {
   if (input_tensor != nullptr) {
-    for (size_t i = 0; i < input_tensor->size(); i++) {
-      delete (*input_tensor)[i];
-      (*input_tensor)[i] = nullptr;
+    for (auto &i : *input_tensor) {
+      delete i;
+      i = nullptr;
     }
   }
   if (output_tensor != nullptr) {
-    for (size_t i = 0; i < output_tensor->size(); i++) {
-      delete (*output_tensor)[i];
-      (*output_tensor)[i] = nullptr;
+    for (auto &i : *output_tensor) {
+      delete i;
+      i = nullptr;
     }
   }
 }
@@ -231,9 +232,9 @@ const AnfNodePtr ConstFoldPass::Process(const FuncGraphPtr &func_graph, const An
     // here, input_tensor's format need to be transposed nhwc according to fmkType,
     // but for the time being, we only transpose the tensor with 0/1/2/3D.
     // Others should be added in future.
-    for (size_t j = 0; j < input_tensors.size(); ++j) {
-      input_tensors[j]->SetFormat(schema::Format::Format_NHWC);
-      if (input_tensors[j]->shape().size() == 4) {
+    for (auto &input_tensor : input_tensors) {
+      input_tensor->SetFormat(schema::Format::Format_NHWC);
+      if (input_tensor->shape().size() == 4) {
         MS_LOG(INFO) << "init input_tensor format to nhwc";
       }
     }
diff --git a/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.cc b/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.cc
index a841e4d55d..208edf15b0 100644
--- a/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.cc
+++ b/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.cc
@@ -233,14 +233,11 @@ const void ConvTransformFusion::CalNewWeightTensor(float *weight_data, int kerne
     delete[] tmp_weight_data;
     return;
   }
-
-  if (tmp_weight_data != nullptr) {
-    delete[] tmp_weight_data;
-  }
+  delete[] tmp_weight_data;
 }
 
 const void ConvTransformFusion::CalNewBiasTensor(float *bias_data, int kernel_num, bool bias_flag,
-                                                 const float *trans_scale, const float *trans_bias) const {
+                                                 const float *trans_scale, const float *trans_bias) {
   MS_ASSERT(bias_data != nullptr);
   if (bias_flag) {
     auto tmp_bias_data = new (std::nothrow) float[kernel_num];
diff --git a/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.h b/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.h
index 2017b0de27..da161c0192 100644
--- a/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.h
+++ b/mindspore/lite/tools/optimizer/fusion/conv_transform_fusion.h
@@ -31,7 +31,7 @@ class ConvTransformFusion : public PatternProcessPass {
   virtual const void InitTransParam(const CNodePtr &, int, float *, float *) const = 0;
   const void GenNewConvTensor(const FuncGraphPtr &, const CNodePtr &, int, const float *, const float *) const;
   const void CalNewWeightTensor(float *, int, int, const float *) const;
-  const void CalNewBiasTensor(float *, int, bool, const float *, const float *) const;
+  static const void CalNewBiasTensor(float *, int, bool, const float *, const float *);
 };
 }  // namespace mindspore::opt
 #endif  // MINDSPORE_LITE_SRC_PASS_FUSION_CONV_TRANSFORM_FUSION_H_
diff --git a/mindspore/lite/tools/optimizer/graph/unused_transpose_node_remove_pass.cc b/mindspore/lite/tools/optimizer/graph/unused_transpose_node_remove_pass.cc
index 67f277215a..2493b3345d 100644
--- a/mindspore/lite/tools/optimizer/graph/unused_transpose_node_remove_pass.cc
+++ b/mindspore/lite/tools/optimizer/graph/unused_transpose_node_remove_pass.cc
@@ -79,7 +79,6 @@ bool RemoveUnusedTransposeOpPass::Run(const FuncGraphPtr &func_graph) {
         MS_LOG(ERROR) << "Transpose node of onnx need to removed which has not primitiveT";
         return RET_ERROR;
       }
-      MS_ASSERT(primT->value != nullptr);
       MS_ASSERT(primT->value.AsTranspose() != nullptr);
       std::vector<int32_t> perm = primT->value.AsTranspose()->perm;
       if (perm == kPermNHWC) {