diff --git a/tests/ut/ge/CMakeLists.txt b/tests/ut/ge/CMakeLists.txt
index 856d9d43..773a2686 100755
--- a/tests/ut/ge/CMakeLists.txt
+++ b/tests/ut/ge/CMakeLists.txt
@@ -690,6 +690,7 @@ set(MULTI_PARTS_TEST_FILES
     "graph/manager/run_graph_unittest.cc"
     "graph/partition/dynamic_shape_partition_unittest.cc"
     "graph/manager/graph_manager_unittest.cc"
+    "graph/manager/graph_var_manager_unittest.cc"
     "graph/optimize/mem_rw_conflict_optimize_unittest.cc"
     "graph/optimize/graph_optimize_unittest.cc"
     "session/omg_omg_unittest.cc"
diff --git a/tests/ut/ge/graph/manager/graph_var_manager_unittest.cc b/tests/ut/ge/graph/manager/graph_var_manager_unittest.cc
new file mode 100644
index 00000000..3eda6c47
--- /dev/null
+++ b/tests/ut/ge/graph/manager/graph_var_manager_unittest.cc
@@ -0,0 +1,63 @@
+/**
+ * Copyright 2021 Huawei Technologies Co., Ltd
+ *
+ * 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.
+ */
+#include <gtest/gtest.h>
+#include <memory>
+
+#define protected public
+#define private public
+#include "graph/manager/graph_var_manager.h"
+#include "graph/ge_context.h"
+#undef protected
+#undef private
+
+namespace ge {
+class UtestGraphVarManagerTest : public testing::Test {
+ protected:
+  void SetUp() {}
+  void TearDown() {}
+};
+
+TEST_F(UtestGraphVarManagerTest, test_get_total_memory_size) {
+  size_t total_mem_size = 0;
+  Status ret = VarManager::Instance(0)->GetTotalMemorySize(total_mem_size);
+  EXPECT_EQ(total_mem_size, 1024UL * 1024UL * 1024UL);
+  EXPECT_EQ(ret, SUCCESS);
+}
+
+TEST_F(UtestGraphVarManagerTest, test_set_memory_malloc_size_no_related_option) {
+  const map<string, string> options{};
+  Status ret = VarManager::Instance(0)->SetMemoryMallocSize(options);
+  EXPECT_EQ(VarManager::Instance(0)->graph_mem_max_size_, floor(1024UL * 1024UL * 1024UL * (26.0f / 32.0f)));
+  EXPECT_EQ(VarManager::Instance(0)->var_mem_max_size_, floor(1024UL * 1024UL * 1024UL * (5.0f / 32.0f)));
+  EXPECT_EQ(ret, SUCCESS);
+}
+
+TEST_F(UtestGraphVarManagerTest, test_set_memory_malloc_size_with_user_specify_graph_mem_max_size) {
+  const map<string, string> options{{"ge.graphMemoryMaxSize", 1024UL * 1024UL * 1024UL / 2}};
+  Status ret = VarManager::Instance(0)->SetMemoryMallocSize(options);
+  EXPECT_EQ(VarManager::Instance(0)->graph_mem_max_size_, floor(1024UL * 1024UL * 1024UL / 2));
+  EXPECT_EQ(VarManager::Instance(0)->var_mem_max_size_, floor(1024UL * 1024UL * 1024UL * (5.0f / 32.0f)));
+  EXPECT_EQ(ret, SUCCESS);
+}
+
+TEST_F(UtestGraphVarManagerTest, test_set_memory_malloc_size_with_user_specify_var_mem_max_size) {
+  const map<string, string> options{{"ge.variableMemoryMaxSize", 1024UL * 1024UL * 1024UL / 2}};
+  Status ret = VarManager::Instance(0)->SetMemoryMallocSize(options);
+  EXPECT_EQ(VarManager::Instance(0)->graph_mem_max_size_, floor(1024UL * 1024UL * 1024UL * (26.0f / 32.0f)));
+  EXPECT_EQ(VarManager::Instance(0)->var_mem_max_size_, floor(1024UL * 1024UL * 1024UL / 2));
+  EXPECT_EQ(ret, SUCCESS);
+}
+} // namespace ge