diff --git a/mindspore/lite/tools/converter/quantizer/quant_cast.cc b/mindspore/lite/tools/converter/quantizer/quant_cast.cc
index d6775146c0..a6c0085fae 100644
--- a/mindspore/lite/tools/converter/quantizer/quant_cast.cc
+++ b/mindspore/lite/tools/converter/quantizer/quant_cast.cc
@@ -39,10 +39,7 @@ ValueNodePtr NewQuantCastValueNode(int src_type, int dst_type, const std::vector
 
 STATUS QuantCast::Run(FuncGraphPtr graph) {
   MS_ASSERT(graph != nullptr);
-
   auto cnodes = graph->GetOrderedCnodes();
-  bool first = true;
-
   for (auto &cnode : cnodes) {
     auto primitive_c = GetValueNode<std::shared_ptr<PrimitiveC>>(cnode->input(0));
     auto curnode_quant_type = schema::QuantType_QUANT_NONE;
@@ -51,34 +48,30 @@ STATUS QuantCast::Run(FuncGraphPtr graph) {
     } else {
       curnode_quant_type = primitive_c->GetQuantType();
     }
-    if (first) {
-      if (curnode_quant_type == schema::QuantType_PostTraining && inputDataDType == kNumberTypeFloat32) {
-        auto value_node =
-          NewQuantCastValueNode(kNumberTypeFloat32, kNumberTypeInt8, primitive_c->GetInputQuantParams().front());
-        std::vector<AnfNodePtr> op_inputs = {value_node, cnode->input(1)};
-        auto quant_cast_cnode = graph->NewCNode(op_inputs);
-        quant_cast_cnode->set_fullname_with_scope(cnode->fullname_with_scope() + "_quant_cast");
-        cnode->set_input(1, quant_cast_cnode);
-        MS_LOG(DEBUG) << "Add quant cast at front. "
-                      << "cur_node: " << cnode->fullname_with_scope() << " quant_type: " << curnode_quant_type;
-      }
-      first = false;
-      continue;
-    }
 
     for (size_t i = 1; i < cnode->inputs().size(); i++) {
       auto input_node = cnode->input(i);
-      if (!input_node->isa<CNode>()) {
-        continue;
+      auto is_graph_input = false;
+      if (input_node->isa<Parameter>()) {
+        if (!input_node->cast<ParameterPtr>()->has_default()) {
+          is_graph_input = true;
+        }
       }
-      auto input_cnode = std::dynamic_pointer_cast<CNode>(input_node);
-      auto input_cnode_primitive_c = GetValueNode<std::shared_ptr<PrimitiveC>>(input_cnode->input(0));
-      if (input_cnode_primitive_c == nullptr) {
-        MS_LOG(DEBUG) << "input: " << i << " " << input_cnode->fullname_with_scope() << ": "
-                      << " PrimitiveC is null";
+      if (!input_node->isa<CNode>() && !is_graph_input) {
         continue;
       }
-      auto input_cnode_quant_type = input_cnode_primitive_c->GetQuantType();
+      auto input_cnode_quant_type = schema::QuantType_QUANT_NONE;
+      std::shared_ptr<PrimitiveC> input_cnode_primitive_c = nullptr;
+      if (!is_graph_input) {
+        auto input_cnode = std::dynamic_pointer_cast<CNode>(input_node);
+        input_cnode_primitive_c = GetValueNode<std::shared_ptr<PrimitiveC>>(input_cnode->input(0));
+        if (input_cnode_primitive_c == nullptr) {
+          MS_LOG(DEBUG) << "input: " << i << " " << input_cnode->fullname_with_scope() << ": "
+                        << " PrimitiveC is null";
+          continue;
+        }
+        input_cnode_quant_type = input_cnode_primitive_c->GetQuantType();
+      }
 
       if (curnode_quant_type != input_cnode_quant_type) {
         ValueNodePtr value_node = nullptr;
@@ -94,22 +87,22 @@ STATUS QuantCast::Run(FuncGraphPtr graph) {
         if (value_node == nullptr) {
           MS_LOG(WARNING) << "value_node is null! "
                           << "cur_node: " << cnode->fullname_with_scope() << " quant_type: "
-                          << " input_" << i << ": " << input_cnode->fullname_with_scope()
+                          << " input_" << i << ": "
                           << " quant_type:" << input_cnode_quant_type;
           continue;
         }
-        std::vector<AnfNodePtr> op_inputs = {value_node, input_cnode};
+        std::vector<AnfNodePtr> op_inputs = {value_node, input_node};
         auto quant_cast_cnode = graph->NewCNode(op_inputs);
         quant_cast_cnode->set_fullname_with_scope(cnode->fullname_with_scope() + "_quant_cast_" + std::to_string(i));
         cnode->set_input(i, quant_cast_cnode);
         MS_LOG(DEBUG) << "Add quant cast. "
                       << "cur_node: " << cnode->fullname_with_scope() << " quant_type: " << curnode_quant_type
-                      << " input_" << i << ": " << input_cnode->fullname_with_scope()
+                      << " input_" << i << ": "
                       << " quant_type:" << input_cnode_quant_type;
       } else {
         MS_LOG(DEBUG) << "No need to add quant cast. "
                       << "cur_node: " << cnode->fullname_with_scope() << " quant_type: " << curnode_quant_type
-                      << " input_" << i << ": " << input_cnode->fullname_with_scope()
+                      << " input_" << i << ": "
                       << " quant_type:" << input_cnode_quant_type;
       }
     }