diff --git a/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc b/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc
index 8b9267f820..010c691e75 100644
--- a/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc
+++ b/mindspore/ccsrc/runtime/device/ascend/ascend_memory_manager.cc
@@ -21,9 +21,10 @@
 namespace mindspore {
 namespace device {
 namespace ascend {
-constexpr uint64_t kAscendDeviceMemGB = 30;
+constexpr uint64_t kAscendInitDeviceMemGB = 30;
+constexpr uint64_t kAscendMaxDeviceMemGB = 31;
 constexpr uint64_t kMemSizeGB = 30;
-constexpr uint64_t kAscendDeviceMemSize = (kAscendDeviceMemGB << kMemSizeGB);
+constexpr uint64_t kAscendDeviceMemSize = (kAscendInitDeviceMemGB << kMemSizeGB);
 
 void AscendMemoryManager::MallocDeviceMemory() {
   auto context_mem = GetDeviceMemSizeFromContext();
@@ -58,8 +59,8 @@ uint64_t AscendMemoryManager::GetDeviceMemSizeFromContext() {
   auto gb_str = variable_memory_max_size.substr(0, pos);
   auto gb_var = std::stoull(gb_str);
   MS_LOG(INFO) << "variable_memory_max_size(GB):" << gb_var;
-  if (gb_var > kAscendDeviceMemGB || gb_var == 0) {
-    MS_LOG(EXCEPTION) << "Invalid allocate memory size:" << gb_var << " which should be in (0-30]GB";
+  if (gb_var > kAscendMaxDeviceMemGB || gb_var == 0) {
+    MS_LOG(EXCEPTION) << "Invalid allocate memory size:" << gb_var << " which should be in (0-31]GB";
   }
   return gb_var << kMemSizeGB;
 }
diff --git a/mindspore/context.py b/mindspore/context.py
index 8c7bdc5d17..d4914aef5a 100644
--- a/mindspore/context.py
+++ b/mindspore/context.py
@@ -225,8 +225,8 @@ class _Context:
         """set values of variable_memory_max_size and graph_memory_max_size"""
         if not Validator.check_str_by_regular(variable_memory_max_size, _re_pattern):
             raise ValueError("Context param variable_memory_max_size should be in correct format! Such as \"5GB\"")
-        if int(variable_memory_max_size[:-2]) >= _DEVICE_APP_MEMORY_SIZE:
-            raise ValueError("Context param variable_memory_max_size should be less than 31GB.")
+        if int(variable_memory_max_size[:-2]) > _DEVICE_APP_MEMORY_SIZE:
+            raise ValueError("Context param variable_memory_max_size should be not greater than 31GB.")
         variable_memory_max_size_ = variable_memory_max_size[:-2] + " * 1024 * 1024 * 1024"
         graph_memory_max_size = _DEVICE_APP_MEMORY_SIZE - int(variable_memory_max_size[:-2])
         graph_memory_max_size_ = str(graph_memory_max_size) + " * 1024 * 1024 * 1024"
diff --git a/tests/ut/python/pynative_mode/test_context.py b/tests/ut/python/pynative_mode/test_context.py
index 77e71e969b..53d6e97f78 100644
--- a/tests/ut/python/pynative_mode/test_context.py
+++ b/tests/ut/python/pynative_mode/test_context.py
@@ -115,7 +115,7 @@ def test_variable_memory_max_size():
     with pytest.raises(ValueError):
         context.set_context(variable_memory_max_size="1G")
     with pytest.raises(ValueError):
-        context.set_context(variable_memory_max_size="31GB")
+        context.set_context(variable_memory_max_size="32GB")
     context.set_context(variable_memory_max_size="3GB")