diff --git a/base/function/defer/main.go b/base/function/defer/main.go
index 024b5f1..42ecf9d 100644
--- a/base/function/defer/main.go
+++ b/base/function/defer/main.go
@@ -25,10 +25,31 @@ func demo2() (x int) {
 	return 5
 }
 
+func demo3(index, a, b int) int {
+	ret := a + b
+	fmt.Printf("index: %d, a: %d, b: %d \t ret: %d\n", index, a, b, ret)
+	return ret
+}
+
 func main() {
 	res := demo()
 	fmt.Printf("demo => %T %+v\n", res, res)
 
 	res = demo2()
 	fmt.Printf("demo => %T %+v\n", res, res)
+
+	fmt.Println("=========================================================")
+
+	// 1. defer demo3(1, a, demo3(4, a, b)) 先运算 里面的 demo3	a:1 b:2 ret:3 => defer demo3(1, 1, 3)
+	// 2. a = 0
+	// 3. defer demo3(2, a, demo3(3, a, b)) 先运算 里面的 demo3	a:0 b:2 ret:2 => defer demo3(2, 0, 2)
+	// 4. b = 1
+	// 5. defer demo3(2, a, demo3(3, a, b)) 此处 参数 demo3 已在第3步计算完毕 故为 defer demo3(2, 0, 2)	a:0 b:1 ret:2
+	// 6. defer demo3(1, a, demo3(4, a, b)) 此处 参数 demo3 已在第1步计算完毕 故为 defer demo3(1, 1, 3)	a:0 b:1 ret:4
+	a := 1
+	b := 2
+	defer demo3(1, a, demo3(4, a, b))
+	a = 0
+	defer demo3(2, a, demo3(3, a, b))
+	b = 1
 }