diff --git a/doc/3.PikaScript标准开发流程.md b/doc/3.PikaScript标准开发流程.md
index 089a1b7d0..6ac2e22e5 100644
--- a/doc/3.PikaScript标准开发流程.md
+++ b/doc/3.PikaScript标准开发流程.md
@@ -164,9 +164,9 @@ def set(argPath: str, val: any):
 ``` python
 # Math.py
 class Adder(TinyObj):
-    byInt(a:int, b:int)->int:
+    def byInt(a:int, b:int)->int:
     pass
-    byFloat(a:float, b:float)->float:
+    def byFloat(a:float, b:float)->float:
     pass
 ```
 
@@ -177,9 +177,9 @@ class Adder(TinyObj):
 ``` python
 # Math.py
 class Multiplier(TinyObj):
-    byInt(a:int, b:int)->int:
+    def byInt(a:int, b:int)->int:
     pass
-    byFloat(a:float, b:float)->float:
+    def byFloat(a:float, b:float)->float:
     pass
 ```
 到此类接口就编写完成了。我们在main.py中引入Math包，这样Pika预编译器就会去编译Math类包了。