diff --git a/taskflow/engines/action_engine/engine.py b/taskflow/engines/action_engine/engine.py
index 660c0777..4e4a0c7a 100644
--- a/taskflow/engines/action_engine/engine.py
+++ b/taskflow/engines/action_engine/engine.py
@@ -74,7 +74,8 @@ class ActionEngine(base.EngineBase):
     def suspend(self):
         self._change_state(states.SUSPENDING)
 
-    def get_graph(self):
+    @property
+    def execution_graph(self):
         self.compile()
         return self._root.graph
 
@@ -131,6 +132,7 @@ class ActionEngine(base.EngineBase):
                        result=result)
         self.task_notifier.notify(state, details)
 
+    @lock_utils.locked
     def compile(self):
         if self._root is not None:
             return
diff --git a/taskflow/tests/unit/test_action_engine.py b/taskflow/tests/unit/test_action_engine.py
index 7c535adb..1fcafe77 100644
--- a/taskflow/tests/unit/test_action_engine.py
+++ b/taskflow/tests/unit/test_action_engine.py
@@ -582,14 +582,14 @@ class EngineGraphFlowTest(EngineTestBase):
             TestTask(name='task2'))
 
         engine = self._make_engine(flow)
-        graph = engine.get_graph()
+        graph = engine.execution_graph
         self.assertTrue(isinstance(graph, networkx.DiGraph))
 
     def test_task_graph_property_for_one_task(self):
         flow = TestTask(name='task1')
 
         engine = self._make_engine(flow)
-        graph = engine.get_graph()
+        graph = engine.execution_graph
         self.assertTrue(isinstance(graph, networkx.DiGraph))