diff --git a/mindspore/ccsrc/backend/optimizer/pass/common_subexpression_elimination.cc b/mindspore/ccsrc/backend/optimizer/pass/common_subexpression_elimination.cc
index 40182b8797f..bb5323097a3 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/common_subexpression_elimination.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/common_subexpression_elimination.cc
@@ -105,6 +105,7 @@ bool BackendCSE::CheckReplace(const AnfNodePtr &main, const AnfNodePtr &node, bo
 bool CommonSubexpressionElimination::Run(const FuncGraphPtr &func_graph) {
   MS_EXCEPTION_IF_NULL(func_graph);
   auto backend_cse = std::make_shared<BackendCSE>();
+  MS_EXCEPTION_IF_NULL(backend_cse);
   return backend_cse->Cse(func_graph, func_graph->manager());
 }
 }  // namespace opt
diff --git a/mindspore/ccsrc/backend/optimizer/pass/communication_op_fusion.cc b/mindspore/ccsrc/backend/optimizer/pass/communication_op_fusion.cc
index 7ff1f599c57..aed79184d0e 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/communication_op_fusion.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/communication_op_fusion.cc
@@ -361,6 +361,7 @@ bool CommunicationOpFusion::DoFusion(const FuncGraphPtr &func_graph, const Commu
       continue;
     }
     auto kernel_graph = func_graph->cast<KernelGraphPtr>();
+    MS_EXCEPTION_IF_NULL(kernel_graph);
     auto graph_id = kernel_graph->graph_id();
     AnfNodePtr new_communication_op =
       CreateFusedCommunicationOp(func_graph, communication_op_info, start_index, end_index);
diff --git a/mindspore/ccsrc/backend/optimizer/pass/convert_attr_to_unify_mindir.cc b/mindspore/ccsrc/backend/optimizer/pass/convert_attr_to_unify_mindir.cc
index 36e06a1660f..90d92038810 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/convert_attr_to_unify_mindir.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/convert_attr_to_unify_mindir.cc
@@ -29,11 +29,14 @@ const AnfNodePtr ConvertAttrToUnifyMindIR::Process(const FuncGraphPtr &, const A
     return nullptr;
   }
 
-  CNodePtr cnode = node->cast<CNodePtr>();
+  auto cnode = node->cast<CNodePtr>();
+  MS_EXCEPTION_IF_NULL(cnode);
   auto inputs = cnode->inputs();
   AnfNodePtr op = inputs[0];
+  MS_EXCEPTION_IF_NULL(op);
   if (IsValueNode<Primitive>(op)) {
     auto prim = GetValueNode<PrimitivePtr>(op);
+    MS_EXCEPTION_IF_NULL(prim);
     auto attrs = prim->attrs();
     std::string type_name = prim->name();
     for (auto attr : attrs) {
diff --git a/mindspore/ccsrc/backend/optimizer/pass/convert_const_input_to_attr.cc b/mindspore/ccsrc/backend/optimizer/pass/convert_const_input_to_attr.cc
index 1a7b3541389..02316be0e11 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/convert_const_input_to_attr.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/convert_const_input_to_attr.cc
@@ -34,7 +34,8 @@ const AnfNodePtr ConvertConstInputToAttr::Process(const FuncGraphPtr &, const An
     return nullptr;
   }
 
-  CNodePtr cnode = node->cast<CNodePtr>();
+  auto cnode = node->cast<CNodePtr>();
+  MS_EXCEPTION_IF_NULL(cnode);
   ConstInputToAttrInfoRegister reg;
   if (!ConstInputToAttrInfoRegistry::Instance().GetRegisterByOpName(AnfAlgo::GetCNodeName(cnode), &reg)) {
     return nullptr;
@@ -47,6 +48,7 @@ const AnfNodePtr ConvertConstInputToAttr::Process(const FuncGraphPtr &, const An
   }
   if (AnfAlgo::GetCNodeName(cnode) == prim::kPrimGatherD->name()) {
     auto ms_context = MsContext::GetInstance();
+    MS_EXCEPTION_IF_NULL(ms_context);
     if (ms_context->get_param<std::string>(MS_CTX_DEVICE_TARGET) != kGPUDevice) {
       return nullptr;
     }
diff --git a/mindspore/ccsrc/backend/optimizer/pass/convert_const_scalar_to_tensor.cc b/mindspore/ccsrc/backend/optimizer/pass/convert_const_scalar_to_tensor.cc
index f9a93d25a1c..1177f5e3d91 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/convert_const_scalar_to_tensor.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/convert_const_scalar_to_tensor.cc
@@ -68,6 +68,7 @@ const AnfNodePtr ConvertConstScalarToTensor::Process(const FuncGraphPtr &func_gr
     return nullptr;
   }
   auto cnode = node->cast<CNodePtr>();
+  MS_EXCEPTION_IF_NULL(cnode);
   bool input_changed = false;
   for (size_t i = 0; i < cnode->inputs().size(); ++i) {
     auto new_input = CreateTensorInput(func_graph->cast<KernelGraphPtr>(), cnode->inputs()[i]);
diff --git a/mindspore/ccsrc/backend/optimizer/pass/convert_tuple_output_to_maketuple.cc b/mindspore/ccsrc/backend/optimizer/pass/convert_tuple_output_to_maketuple.cc
index 275a138407e..ad6f48290b1 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/convert_tuple_output_to_maketuple.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/convert_tuple_output_to_maketuple.cc
@@ -38,11 +38,12 @@ AnfNodePtr ConvertTupleInputToMakeTuple(const FuncGraphPtr &graph, const AnfNode
   if (anf_graph != nullptr) {
     kernel_graph = anf_graph->cast<KernelGraphPtr>();
   }
-
+  MS_EXCEPTION_IF_NULL(kernel_graph);
   if (kernel_graph->FindTupleParameterToMakeTupleMap(tuple_anf)) {
     return kernel_graph->FindTupleParameterToMakeTupleMap(tuple_anf);
   }
   auto make_tuple = kernel_graph->TransTupleToMakeTuple(tuple_anf);
+  MS_EXCEPTION_IF_NULL(make_tuple);
   kernel_graph->InsertTupleParameterToMakeTupleMap(tuple_anf, make_tuple);
   // replace graph inputs if input is a parameter
   kernel_graph->ReplaceGraphInput(tuple_anf, make_tuple);
diff --git a/mindspore/ccsrc/backend/optimizer/pass/getitem_tuple.cc b/mindspore/ccsrc/backend/optimizer/pass/getitem_tuple.cc
index 540310ab9a6..54dc5cfc4c7 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/getitem_tuple.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/getitem_tuple.cc
@@ -26,7 +26,7 @@ namespace {
 bool IsC(const BaseRef &n) {
   MS_EXCEPTION_IF_NULL(n);
   if (utils::isa<AnfNodePtr>(n)) {
-    AnfNodePtr in = utils::cast<AnfNodePtr>(n);
+    auto in = utils::cast<AnfNodePtr>(n);
     MS_EXCEPTION_IF_NULL(in);
     return in->isa<ValueNode>();
   } else {
@@ -43,7 +43,7 @@ const BaseRef GetitemTuple::DefinePattern() const {
 
 const AnfNodePtr GetitemTuple::Process(const FuncGraphPtr &, const AnfNodePtr &node, const EquivPtr &) const {
   MS_EXCEPTION_IF_NULL(node);
-  CNodePtr tuple_getitem = node->cast<CNodePtr>();
+  auto tuple_getitem = node->cast<CNodePtr>();
   MS_EXCEPTION_IF_NULL(tuple_getitem);
   CheckCNodeInputSize(tuple_getitem, kTupleGetItemInputTensorNum);
   AnfNodePtr make_tuple_anf = tuple_getitem->input(kRealInputNodeIndexInTupleGetItem);
@@ -51,10 +51,10 @@ const AnfNodePtr GetitemTuple::Process(const FuncGraphPtr &, const AnfNodePtr &n
   AnfNodePtr index_node = tuple_getitem->input(kInputNodeOutputIndexInTupleGetItem);
   MS_EXCEPTION_IF_NULL(index_node);
   if (IsValueNode<Int64Imm>(index_node)) {
-    ValueNodePtr value_node = index_node->cast<ValueNodePtr>();
+    auto value_node = index_node->cast<ValueNodePtr>();
     MS_EXCEPTION_IF_NULL(value_node);
     auto index = GetValue<int64_t>(value_node->value());
-    CNodePtr make_tuple = make_tuple_anf->cast<CNodePtr>();
+    auto make_tuple = make_tuple_anf->cast<CNodePtr>();
     MS_EXCEPTION_IF_NULL(make_tuple);
     if (make_tuple->inputs().size() > LongToSize(index + 1)) {
       auto ret = make_tuple->input(LongToSize(index + 1));
diff --git a/mindspore/ccsrc/backend/optimizer/pass/optimize_dependence.cc b/mindspore/ccsrc/backend/optimizer/pass/optimize_dependence.cc
index b6ad9e7e812..e8f311c04d3 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/optimize_dependence.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/optimize_dependence.cc
@@ -60,6 +60,7 @@ CNodePtr CheckIsolatedVirtualNode(const CNodePtr &cnode) {
     return nullptr;
   }
   auto real_input_op = AnfAlgo::GetInputNode(cnode, kIsolatedDependRealInputIndex);
+  MS_EXCEPTION_IF_NULL(real_input_op);
   if (!real_input_op->isa<CNode>()) {
     return nullptr;
   }
@@ -210,6 +211,7 @@ const AnfNodePtr OptimizeDependence::GetConvertNode(const FuncGraphPtr &graph, c
   MS_EXCEPTION_IF_NULL(graph);
   MS_EXCEPTION_IF_NULL(node);
   auto depend_cnode = node->cast<CNodePtr>();
+  MS_EXCEPTION_IF_NULL(depend_cnode);
   auto replacing_node = depend_cnode->input(index);
   MS_EXCEPTION_IF_NULL(replacing_node);
   if (!replacing_node->isa<CNode>()) {
diff --git a/mindspore/ccsrc/backend/optimizer/pass/optimize_updatestate.cc b/mindspore/ccsrc/backend/optimizer/pass/optimize_updatestate.cc
index 30bff16acbc..20cae4c1fa2 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/optimize_updatestate.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/optimize_updatestate.cc
@@ -35,6 +35,8 @@ const BaseRef OptimizeUpdateState::DefinePattern() const {
 
 const AnfNodePtr OptimizeUpdateState::Process(const FuncGraphPtr &func_graph, const AnfNodePtr &node,
                                               const EquivPtr &) const {
+  MS_EXCEPTION_IF_NULL(func_graph);
+  MS_EXCEPTION_IF_NULL(node);
   auto update_state = dyn_cast<CNode>(node);
   MS_EXCEPTION_IF_NULL(update_state);
   if (update_state->size() <= kAdditionalAttachIndex) {
diff --git a/mindspore/ccsrc/backend/optimizer/pass/replace_node_by_proxy.cc b/mindspore/ccsrc/backend/optimizer/pass/replace_node_by_proxy.cc
index d4fe31013f1..142f5588cb1 100644
--- a/mindspore/ccsrc/backend/optimizer/pass/replace_node_by_proxy.cc
+++ b/mindspore/ccsrc/backend/optimizer/pass/replace_node_by_proxy.cc
@@ -60,7 +60,8 @@ bool ReplaceNodeByProxy::Run(const FuncGraphPtr &func_graph) {
   for (auto node : node_list) {
     if (node != nullptr && node->isa<CNode>() && AnfAlgo::GetCNodeName(node) == kEmbeddingLookupOpName) {
       TraceGuard guard(std::make_shared<TraceOpt>(node->debug_info()));
-      CNodePtr cnode = node->cast<CNodePtr>();
+      auto cnode = node->cast<CNodePtr>();
+      MS_EXCEPTION_IF_NULL(cnode);
       auto prim = std::make_shared<Primitive>(kEmbeddingLookupProxyOpName);
       MS_EXCEPTION_IF_NULL(prim);
       std::vector<AnfNodePtr> proxy_inputs = {NewValueNode(prim)};