diff --git a/inc/graphengine/inc/framework/common/string_util.h b/inc/graphengine/inc/framework/common/string_util.h
index f03683633b8ecd344c9a46740461678a6e51bb97..c1216d90aae4581e650d14df679afc0dec5c95c3 100644
--- a/inc/graphengine/inc/framework/common/string_util.h
+++ b/inc/graphengine/inc/framework/common/string_util.h
@@ -45,18 +45,21 @@ class GE_FUNC_VISIBILITY StringUtils {
  public:
   static std::string &Ltrim(std::string &s) {
 #if __cplusplus >= 201103L
-    (void)s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](int c) { return !std::isspace(c); }));
+    (void)s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](const int32_t c) { return std::isspace(c) == 0; }));
 #else
-    (void)s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1(std::ptr_fun<int, int>(std::isspace))));
+    (void)s.erase(s.begin(), std::find_if(s.begin(), s.end(),
+                                          std::not1(std::ptr_fun<int32_t, int32_t>(std::isspace))));
 #endif
     return s;
   }
   // lint -esym(551,*)
   static std::string &Rtrim(std::string &s) {  /*lint !e618*/
 #if __cplusplus >= 201103L
-    (void)s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](int c) { return !std::isspace(c); }));
+    (void)s.erase(std::find_if(s.rbegin(), s.rend(), [](const int32_t c) { return std::isspace(c) == 0; }).base(),
+                  s.end());
 #else
-    (void)s.erase(std::find_if(s.rbegin(), s.rend(), std::not1(std::ptr_fun<int, int>(std::isspace))).base(), s.end());
+    (void)s.erase(std::find_if(s.rbegin(), s.rend(), std::not1(std::ptr_fun<int32_t, int32_t>(std::isspace))).base(),
+                  s.end());
 #endif
     return s;
   }
diff --git a/tf_adapter/tests/st/optimizers/testcase/om_partition_subgraphs_pass_test.cc b/tf_adapter/tests/st/optimizers/testcase/om_partition_subgraphs_pass_test.cc
index 38e0704299108191e82e5d966ed9b68a867a4fcd..53c4eb0e4bf5f451db5e0aaed235cbe9bb46d7c4 100644
--- a/tf_adapter/tests/st/optimizers/testcase/om_partition_subgraphs_pass_test.cc
+++ b/tf_adapter/tests/st/optimizers/testcase/om_partition_subgraphs_pass_test.cc
@@ -212,7 +212,7 @@ TEST_F(OmOptimizationPassTest, StringInputMaxSizeTest) {
   std::string target_graph = DoRunOmOptimizationPassTest();
   EXPECT_EQ(target_graph, "arg_input_0_0->DecodeJpeg;DecodeJpeg->retval_DecodeJpeg_0_0");
 }
-TEST_F(OmOptimizationPassTest, NpuOpsIdentifierTest01) {
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest01) {
   SetLogLevelForC(0);
   std::string opp_path = __FILE__;
   opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
@@ -224,7 +224,78 @@ TEST_F(OmOptimizationPassTest, NpuOpsIdentifierTest01) {
   system(("mkdir -p " + path_vendors).c_str());
   system(("echo 'load_priority=customize,mdc,lhisi' > " + path_config).c_str());
   std::vector<std::string> vendors;
-  NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors);
+  EXPECT_TRUE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 3);
+  EXPECT_EQ(vendors[0], "customize");
+  EXPECT_EQ(vendors[1], "mdc");
+  EXPECT_EQ(vendors[2], "lhisi");
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest02) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("echo '' > " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_FALSE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 0);
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest03) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("echo 'load_priority' > " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_FALSE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 0);
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest04) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("rm -rf " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_FALSE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 0);
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest05) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("echo ' load_priority = customize , mdc , lhisi ' > " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_TRUE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
   EXPECT_EQ(vendors.size(), 3);
   EXPECT_EQ(vendors[0], "customize");
   EXPECT_EQ(vendors[1], "mdc");
diff --git a/tf_adapter/tests/ut/optimizers/testcase/om_partition_subgraphs_pass_test.cc b/tf_adapter/tests/ut/optimizers/testcase/om_partition_subgraphs_pass_test.cc
index 38e0704299108191e82e5d966ed9b68a867a4fcd..53c4eb0e4bf5f451db5e0aaed235cbe9bb46d7c4 100644
--- a/tf_adapter/tests/ut/optimizers/testcase/om_partition_subgraphs_pass_test.cc
+++ b/tf_adapter/tests/ut/optimizers/testcase/om_partition_subgraphs_pass_test.cc
@@ -212,7 +212,7 @@ TEST_F(OmOptimizationPassTest, StringInputMaxSizeTest) {
   std::string target_graph = DoRunOmOptimizationPassTest();
   EXPECT_EQ(target_graph, "arg_input_0_0->DecodeJpeg;DecodeJpeg->retval_DecodeJpeg_0_0");
 }
-TEST_F(OmOptimizationPassTest, NpuOpsIdentifierTest01) {
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest01) {
   SetLogLevelForC(0);
   std::string opp_path = __FILE__;
   opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
@@ -224,7 +224,78 @@ TEST_F(OmOptimizationPassTest, NpuOpsIdentifierTest01) {
   system(("mkdir -p " + path_vendors).c_str());
   system(("echo 'load_priority=customize,mdc,lhisi' > " + path_config).c_str());
   std::vector<std::string> vendors;
-  NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors);
+  EXPECT_TRUE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 3);
+  EXPECT_EQ(vendors[0], "customize");
+  EXPECT_EQ(vendors[1], "mdc");
+  EXPECT_EQ(vendors[2], "lhisi");
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest02) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("echo '' > " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_FALSE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 0);
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest03) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("echo 'load_priority' > " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_FALSE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 0);
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest04) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("rm -rf " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_FALSE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
+  EXPECT_EQ(vendors.size(), 0);
+  ClearLogLevelForC();
+  system(("rm -rf " + opp_path).c_str());
+}
+TEST_F(OmOptimizationPassTest, GetOppPluginVendorsTest05) {
+  SetLogLevelForC(0);
+  std::string opp_path = __FILE__;
+  opp_path = opp_path.substr(0, opp_path.rfind("/") + 1) + "opp_path/";
+  setenv("ASCEND_OPP_PATH", opp_path.c_str(), 1);
+  std::string path_builtin = opp_path + "built-in";
+  std::string path_vendors = opp_path + "vendors";
+  std::string path_config = path_vendors + "/config.ini";
+  system(("mkdir -p " + path_builtin).c_str());
+  system(("mkdir -p " + path_vendors).c_str());
+  system(("echo ' load_priority = customize , mdc , lhisi ' > " + path_config).c_str());
+  std::vector<std::string> vendors;
+  EXPECT_TRUE(NpuOpsIdentifier::GetOppPluginVendors(path_config, vendors));
   EXPECT_EQ(vendors.size(), 3);
   EXPECT_EQ(vendors[0], "customize");
   EXPECT_EQ(vendors[1], "mdc");
diff --git a/tf_adapter/util/npu_ops_identifier.cc b/tf_adapter/util/npu_ops_identifier.cc
index e2b504552f53c30d031f8b99c8df6ac952482467..ada3082f303578375d1274dae606479f1709343d 100644
--- a/tf_adapter/util/npu_ops_identifier.cc
+++ b/tf_adapter/util/npu_ops_identifier.cc
@@ -74,6 +74,7 @@ bool NpuOpsIdentifier::GetOppPluginVendors(const std::string &vendors_config, st
     ADP_LOG(ERROR) << "Format of file content is invalid!";
     return false;
   }
+  (void) for_each(vendors.begin(), vendors.end(), &ge::StringUtils::Trim);
   return true;
 }