diff --git a/ch1-basic/ch1-04-func-method-interface.md b/ch1-basic/ch1-04-func-method-interface.md
index ee6236e..34c9551 100644
--- a/ch1-basic/ch1-04-func-method-interface.md
+++ b/ch1-basic/ch1-04-func-method-interface.md
@@ -245,13 +245,13 @@ f, _ := OpenFile("foo.dat")
 
 // 绑定到了 f 对象
 // func Close() error
-var Close = func Close() error {
+var Close = func() error {
 	return (*File).Close(f)
 }
 
 // 绑定到了 f 对象
 // func Read(offset int64, data []byte) int
-var Read = func Read(offset int64, data []byte) int {
+var Read = func(offset int64, data []byte) int {
 	return (*File).Read(f, offset, data)
 }
 
diff --git a/ch2-cgo/ch2-03-cgo-types.md b/ch2-cgo/ch2-03-cgo-types.md
index 8fbb53f..ab5a188 100644
--- a/ch2-cgo/ch2-03-cgo-types.md
+++ b/ch2-cgo/ch2-03-cgo-types.md
@@ -326,8 +326,10 @@ static char arr[10];
 static char *s = "Hello";
 */
 import "C"
-import "fmt"
-
+import (
+	"reflect"
+	"unsafe"
+)
 func main() {
 	// 通过 reflect.SliceHeader 转换
 	var arr0 []byte
diff --git a/ch2-cgo/ch2-05-internal.md b/ch2-cgo/ch2-05-internal.md
index 1dc0777..a5e09ea 100644
--- a/ch2-cgo/ch2-05-internal.md
+++ b/ch2-cgo/ch2-05-internal.md
@@ -162,7 +162,7 @@ func main() {}
 CGO的语法细节不在赘述。为了在C语言中使用sum函数，我们需要将Go代码编译为一个C静态库：
 
 ```
-$ go build -buildmode=c-archive -o sum.a sum.go
+$ go build -buildmode=c-archive -o sum.a main.go
 ```
 
 如果没有错误的话，以上编译命令将生成一个`sum.a`静态库和`sum.h`头文件。其中`sum.h`头文件将包含sum函数的声明，静态库中将包含sum函数的实现。