diff --git a/docs/Secondary_development/hook.md b/docs/Secondary_development/hook.md
index 0b746b4ff67d3ac0d0ff43027280d56d52ac3bd1..c08ab1ef43fbea3b6b18fd8db49d9d6cbaa696f5 100644
--- a/docs/Secondary_development/hook.md
+++ b/docs/Secondary_development/hook.md
@@ -19,6 +19,7 @@ Task定义了[组网事件](./how_to_define_task.md)和[运行事件](./how_to_d
 
 ```python
 import time
+from collections import OrderedDict
 
 import numpy as np