diff --git a/mindspore/ccsrc/frontend/optimizer/irpass/branch_culling.h b/mindspore/ccsrc/frontend/optimizer/irpass/branch_culling.h
index 72a6a4df9fa9505afa6a8c12c19234b1df59e9d9..bcc6bf311f40b316e73bb94c7540e4894a50b04e 100644
--- a/mindspore/ccsrc/frontend/optimizer/irpass/branch_culling.h
+++ b/mindspore/ccsrc/frontend/optimizer/irpass/branch_culling.h
@@ -98,12 +98,19 @@ class ConvertSwitchReplacement : public OptimizerCaller {
       return nullptr;
     }
 
+    auto cnode_ = node->cast<CNodePtr>();
+    if (cnode_->size() < 1) {
+      return nullptr;
+    }
+
+    auto node_ = cnode_->input(0);
+
     PatternNode<AnfNodePtr> cond, true_br, false_br;
 
-    auto ConvertSwitchLambda = [&node, &cond, &true_br, &false_br]() -> AnfNodePtr {
-      auto g1_ = GetValueNode<FuncGraphPtr>(true_br.GetNode(node));
-      auto g2_ = GetValueNode<FuncGraphPtr>(false_br.GetNode(node));
-      auto x_ = cond.GetNode(node);
+    auto ConvertSwitchLambda = [&node_, &cond, &true_br, &false_br]() -> AnfNodePtr {
+      auto g1_ = GetValueNode<FuncGraphPtr>(true_br.GetNode(node_));
+      auto g2_ = GetValueNode<FuncGraphPtr>(false_br.GetNode(node_));
+      auto x_ = cond.GetNode(node_);
 
       // for switch replace method, only graphs without graph inside can be replaced
       for (auto &item : g1_->value_nodes()) {
@@ -126,7 +133,7 @@ class ConvertSwitchReplacement : public OptimizerCaller {
       auto trans_g2 = internal::TransformGraphCondFalseBranchNodes(g2_, x_);
 
       std::vector<AnfNodePtr> params;
-      auto fg = node->func_graph();
+      auto fg = node_->func_graph();
       auto cloned_g1 = InlineClone(trans_g1, fg, params);
       auto cloned_g2 = InlineClone(trans_g2, fg, params);
       auto nnode = internal::TransformMergeBranches(cloned_g1, cloned_g2, true_output, false_output, x_, fg);
@@ -135,8 +142,8 @@ class ConvertSwitchReplacement : public OptimizerCaller {
     };
 
     MATCH_REPLACE_LAMBDA_IF(
-      node, PCNode(PPrimitive(prim::kPrimSwitch, cond, true_br, false_br)).MinExtraNodes(0), ConvertSwitchLambda,
-      true_br.CheckFunc(IsValueNode<FuncGraph>, node) && false_br.CheckFunc(IsValueNode<FuncGraph>, node));
+      node_, PPrimitive(prim::kPrimSwitch, cond, true_br, false_br), ConvertSwitchLambda,
+      true_br.CheckFunc(IsValueNode<FuncGraph>, node_) && false_br.CheckFunc(IsValueNode<FuncGraph>, node_));
 
     return nullptr;
   }