diff --git a/mindinsight/mindconverter/graph_based_converter/mapper/impl/nn/drop_out_mapper.py b/mindinsight/mindconverter/graph_based_converter/mapper/impl/nn/drop_out_mapper.py
new file mode 100644
index 00000000..622a90b4
--- /dev/null
+++ b/mindinsight/mindconverter/graph_based_converter/mapper/impl/nn/drop_out_mapper.py
@@ -0,0 +1,37 @@
+# Copyright 2021 Huawei Technologies Co., Ltd.All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Mapper module."""
+from mindinsight.mindconverter.graph_based_converter.mapper.base import ONNXToMindSporeMapper
+
+
+class DropoutMapper(ONNXToMindSporeMapper):
+    """Dropout mapper."""
+
+    @staticmethod
+    def _operation_name_in_ms(*args, **kwargs):
+        return "nn.Dropout"
+
+    @staticmethod
+    def _convert_params(**kwargs):
+        params = kwargs["params"]
+        if params.get("training_mode", False):
+            ratio = 1.0 - params.get('ratio', 0.5)
+        else:
+            ratio = 1.0
+        return {'keep_prob': ratio}
+
+    @staticmethod
+    def _convert_trained_weights(**kwargs):
+        return dict()
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 c4e660cd..51ff84eb 100644
--- a/mindinsight/mindconverter/graph_based_converter/mapper/onnx_to_ms.json
+++ b/mindinsight/mindconverter/graph_based_converter/mapper/onnx_to_ms.json
@@ -41,5 +41,6 @@
   "onnx::CumSum": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.cumsum_mapper.CumSumMapper",
   "onnx::Sin": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.sin_mapper.SinMapper",
   "onnx::Cos": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.cos_mapper.CosMapper",
-  "onnx::ReduceSum": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.reduce_sum_mapper.ReduceSumMapper"
+  "onnx::ReduceSum": "mindinsight.mindconverter.graph_based_converter.mapper.impl.ops.reduce_sum_mapper.ReduceSumMapper",
+  "onnx::Dropout": "mindinsight.mindconverter.graph_based_converter.mapper.impl.nn.drop_out_mapper.DropoutMapper"
 }
\ No newline at end of file