diff --git a/eva/executor/explain_executor.py b/eva/executor/explain_executor.py
index 85275bfca4..d136ab3269 100644
--- a/eva/executor/explain_executor.py
+++ b/eva/executor/explain_executor.py
@@ -33,5 +33,5 @@ def exec(self):
     def _exec(self, node: AbstractPlan, depth: int):
         cur_str = " " * depth * 4 + "|__ " + str(node) + "\n"
         for child in node.children:
-            cur_str += self.exec(child, depth + 1)
+            cur_str += self._exec(child, depth + 1)
         return cur_str
\ No newline at end of file