diff --git a/mindinsight/mindconverter/graph_based_converter/mapper/impl/ops/mat_mul_mapper.py b/mindinsight/mindconverter/graph_based_converter/mapper/impl/nn/mat_mul_mapper.py
similarity index 90%
rename from mindinsight/mindconverter/graph_based_converter/mapper/impl/ops/mat_mul_mapper.py
rename to mindinsight/mindconverter/graph_based_converter/mapper/impl/nn/mat_mul_mapper.py
index fd088566..1cb26605 100644
--- a/mindinsight/mindconverter/graph_based_converter/mapper/impl/ops/mat_mul_mapper.py
+++ b/mindinsight/mindconverter/graph_based_converter/mapper/impl/nn/mat_mul_mapper.py
@@ -23,7 +23,7 @@ class MatMulMapper(ONNXToMindSporeMapper):
 
     @staticmethod
     def _operation_name_in_ms(*args, **kwargs):
-        return "P.matmul"
+        return "nn.MatMul"
 
     @staticmethod
     def _convert_params(**kwargs):
@@ -50,19 +50,19 @@ class MatMulMapper(ONNXToMindSporeMapper):
         variable_slot = "var_0"
 
         w_location = MatMulMapper._find_location_by_index(0, weights)
-        init_tensor_list = list()
 
+        init_template_list = [f"self.{{{variable_slot}}} = {op}()"]
         inputs_in_construct = [f"{{{ExchangeMessageKeywords.VariableScope.value.INPUTS.value}}}"]
         if w_location != -1:
             # Note: adding weight shape to args is now deprecated due to conflict of partial weights share processing.
             variable_slot_param_name = f"{variable_slot}/w"
-            init_tensor_list.append(f"self.{{{variable_slot}}}_w = {{{variable_slot_param_name}}}")
+            init_template_list.append(f"self.{{{variable_slot}}}_w = {{{variable_slot_param_name}}}")
             inputs_in_construct.insert(w_location, f"self.{{{variable_slot}}}_w")
-        construct_template = f"opt_{{{variable_slot}}} = {op}({', '.join(inputs_in_construct)})"
+        construct_template = f"opt_{{{variable_slot}}} = self.{{{variable_slot}}}({', '.join(inputs_in_construct)})"
 
         template = {
             variable_slot: {
-                TemplateKeywords.INIT.value: init_tensor_list,
+                TemplateKeywords.INIT.value: init_template_list,
                 TemplateKeywords.CONSTRUCT.value: [construct_template]
             }
         }
diff --git a/mindinsight/mindconverter/graph_based_converter/mapper/onnx_to_ms.json b/mindinsight/mindconverter/graph_based_converter/mapper/onnx_to_ms.json
index 19dcaa9e..0cb96d15 100644
--- a/mindinsight/mindconverter/graph_based_converter/mapper/onnx_to_ms.json
+++ b/mindinsight/mindconverter/graph_based_converter/mapper/onnx_to_ms.json
@@ -13,7 +13,7 @@
   "onnx::Concat": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.concat_mapper.ConcatMapper",
   "onnx::Clip": "mindinsight.mindconverter.graph_based_converter.mapper.impl.nn.relu_mapper.ReLUMapper",
   "onnx::Transpose": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.transpose_mapper.TransposeMapper",
-  "onnx::MatMul": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.mat_mul_mapper.MatMulMapper",
+  "onnx::MatMul": "mindinsight.mindconverter.graph_based_converter.mapper.impl.nn.mat_mul_mapper.MatMulMapper",
   "onnx::Softmax": "mindinsight.mindconverter.graph_based_converter.mapper.impl.nn.softmax_mapper.SoftmaxMapper",
   "onnx::OneHot": "mindinsight.mindconverter.graph_based_converter.mapper.impl.nn.one_hot_mapper.OneHotMapper",
   "onnx::Neg": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.neg_mapper.NegMapper",