diff --git a/mindspore/lite/include/errorcode.h b/mindspore/lite/include/errorcode.h
index 72a51d71184..cf614708440 100644
--- a/mindspore/lite/include/errorcode.h
+++ b/mindspore/lite/include/errorcode.h
@@ -17,6 +17,8 @@
 #ifndef MINDSPORE_LITE_INCLUDE_ERRORCODE_H_
 #define MINDSPORE_LITE_INCLUDE_ERRORCODE_H_
 
+#include <string>
+
 namespace mindspore {
 namespace lite {
 /// \brief STATUS defined for holding error code in MindSpore Lite.
@@ -61,7 +63,9 @@ constexpr int RET_INPUT_PARAM_INVALID = -600; /**< Invalid input param by user.
 /// \brief Print description of errorcode.
 ///
 /// \param[in] error_code define return status of procedure.
-void PrintErrorInfo(STATUS error_code);
+///
+/// \return String of errorcode info.
+std::string GetErrorInfo(STATUS error_code);
 }  // namespace lite
 }  // namespace mindspore
 
diff --git a/mindspore/lite/src/errorcode.cc b/mindspore/lite/src/errorcode.cc
index e052af782d5..1c555fccb27 100644
--- a/mindspore/lite/src/errorcode.cc
+++ b/mindspore/lite/src/errorcode.cc
@@ -16,12 +16,11 @@
 
 #include "include/errorcode.h"
 #include <map>
-#include <iostream>
 #include <string>
 
 namespace mindspore {
 namespace lite {
-void PrintErrorInfo(STATUS status) {
+std::string GetErrorInfo(STATUS status) {
   std::map<int, std::string> info_map = {{RET_OK, "No error occurs."},
                                          {RET_ERROR, "Common error code."},
                                          {RET_NULL_PTR, "NULL pointer returned."},
@@ -42,7 +41,7 @@ void PrintErrorInfo(STATUS status) {
                                          {RET_INFER_ERR, "Failed to infer shape."},
                                          {RET_INFER_INVALID, "Invalid infer shape before runtime."},
                                          {RET_INPUT_PARAM_INVALID, "Invalid input param by user."}};
-  std::cout << info_map[status] << std::endl;
+  return info_map.find(status) == info_map.end() ? "Unknown error" : info_map[status];
 }
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/lite_session.cc b/mindspore/lite/src/lite_session.cc
index 75b0bf7d3a9..0a4b0923b46 100644
--- a/mindspore/lite/src/lite_session.cc
+++ b/mindspore/lite/src/lite_session.cc
@@ -269,6 +269,11 @@ int LiteSession::CompileGraph(Model *model) {
     is_running_.store(false);
     return RET_PARAM_INVALID;
   }
+  if (model->buf == nullptr) {
+    MS_LOG(ERROR) << "The input model buf is nullptr.";
+    is_running_.store(false);
+    return RET_PARAM_INVALID;
+  }
 
   auto ret = ConvertTensors(model);
   if (ret != RET_OK) {
diff --git a/mindspore/lite/tools/converter/converter.cc b/mindspore/lite/tools/converter/converter.cc
index e1e047b9355..a8ce4ebc132 100644
--- a/mindspore/lite/tools/converter/converter.cc
+++ b/mindspore/lite/tools/converter/converter.cc
@@ -106,18 +106,17 @@ MetaGraphT *Converter::Convert(const converter::Flags *flag) {
 int RunConverter(int argc, const char **argv) {
   std::unique_ptr<converter::Flags> flags(new (std::nothrow) converter::Flags);
   if (flags == nullptr) {
-    MS_LOG(ERROR) << "new flags error ";
-    std::cout << "NEW FLAGS ERROR:" << RET_MEMORY_FAILED << std::endl;
-    PrintErrorInfo(RET_MEMORY_FAILED);
+    MS_LOG(ERROR) << "NEW FLAGS ERROR:" << RET_MEMORY_FAILED << " " << GetErrorInfo(RET_MEMORY_FAILED);
+    std::cout << "NEW FLAGS ERROR:" << RET_MEMORY_FAILED << " " << GetErrorInfo(RET_MEMORY_FAILED) << std::endl;
     return RET_MEMORY_FAILED;
   }
   auto status = flags->Init(argc, argv);
   if (status != RET_OK) {
     if (status != RET_SUCCESS_EXIT) {
-      MS_LOG(ERROR) << "converter::Flags Init failed: " << status;
-      std::cout << "CONVERTER::FLAGS INIT FAILED:" << status << std::endl;
+      MS_LOG(ERROR) << "CONVERTER::FLAGS INIT FAILED:" << status << " " << GetErrorInfo(status) << std::endl;
+      std::cout << "CONVERTER::FLAGS INIT FAILED:" << status << " " << GetErrorInfo(status) << std::endl;
     }
-    PrintErrorInfo(status);
+    std::cout << GetErrorInfo(status) << std::endl;
     return status;
   }
   // Load graph
@@ -147,18 +146,18 @@ int RunConverter(int argc, const char **argv) {
       fb_graph = onnxConverter.Convert(flags.get());
     } break;
     default: {
-      MS_LOG(ERROR) << "Unsupported fmkType: " << flags->fmk;
-      std::cout << "UNSUPPORTED FMKTYPE " << flags->fmk << ":" << RET_INPUT_PARAM_INVALID << std::endl;
-      PrintErrorInfo(RET_INPUT_PARAM_INVALID);
+      MS_LOG(ERROR) << "UNSUPPORTED FMKTYPE " << flags->fmk << ":" << RET_INPUT_PARAM_INVALID << " "
+                    << GetErrorInfo(RET_INPUT_PARAM_INVALID);
+      std::cout << "UNSUPPORTED FMKTYPE " << flags->fmk << ":" << RET_INPUT_PARAM_INVALID << " "
+                << GetErrorInfo(RET_INPUT_PARAM_INVALID) << std::endl;
       return RET_INPUT_PARAM_INVALID;
     }
   }
   NoSupportOp::GetInstance()->PrintOps();
   status = ReturnCode::GetSingleReturnCode()->GetReturnCode();
   if (fb_graph == nullptr) {
-    MS_LOG(ERROR) << "Convert model return nullptr";
-    std::cout << "CONVERT RESULT FAILED:" << status << std::endl;
-    PrintErrorInfo(status);
+    MS_LOG(ERROR) << "CONVERT RESULT FAILED:" << status << " " << GetErrorInfo(status);
+    std::cout << "CONVERT RESULT FAILED:" << status << " " << GetErrorInfo(status) << std::endl;
     return status;
   }
 
@@ -167,16 +166,14 @@ int RunConverter(int argc, const char **argv) {
   fb_graph->version = Version();
   status = storage.Save(*fb_graph, flags->outputFile);
   if (status != RET_OK) {
-    MS_LOG(ERROR) << "Save graph to file failed";
-    std::cout << "SAVE GRAPH FAILED:" << status << std::endl;
-    PrintErrorInfo(status);
+    MS_LOG(ERROR) << "SAVE GRAPH FAILED:" << status << " " << GetErrorInfo(status);
+    std::cout << "SAVE GRAPH FAILED:" << status << " " << GetErrorInfo(status) << std::endl;
     return status;
   }
 
   delete fb_graph;
-  MS_LOG(INFO) << "CONVERT RESULT: SUCCESS!";
+  MS_LOG(INFO) << "CONVERT RESULT SUCCESS:" << status;
   std::cout << "CONVERT RESULT SUCCESS:" << status << std::endl;
-  PrintErrorInfo(status);
   return status;
 }
 }  // namespace lite