diff --git a/mindspore/lite/src/cxx_api/graph/graph.cc b/mindspore/lite/src/cxx_api/graph/graph.cc
index cdacd62df53..e1c57cdeffb 100644
--- a/mindspore/lite/src/cxx_api/graph/graph.cc
+++ b/mindspore/lite/src/cxx_api/graph/graph.cc
@@ -30,5 +30,5 @@ Graph::Graph(std::nullptr_t) : graph_data_(nullptr) {}
 
 bool Graph::operator==(std::nullptr_t) const { return graph_data_ == nullptr; }
 
-ModelType Graph::ModelType() const { return graph_data_->ModelType(); }
+ModelType Graph::ModelType() const { return kMindIR; }
 }  // namespace mindspore
diff --git a/mindspore/lite/src/cxx_api/graph/graph_data.h b/mindspore/lite/src/cxx_api/graph/graph_data.h
index fdd2aec5162..584035db8dd 100644
--- a/mindspore/lite/src/cxx_api/graph/graph_data.h
+++ b/mindspore/lite/src/cxx_api/graph/graph_data.h
@@ -35,8 +35,6 @@ class Graph::GraphData {
 
   std::shared_ptr<lite::Model> lite_model() { return lite_model_; }
 
-  enum ModelType ModelType() const { return kMindIR; }
-
  private:
   std::shared_ptr<lite::Model> lite_model_;
 };