diff --git a/file.go b/file.go
index 7f7dd86..73a33f7 100644
--- a/file.go
+++ b/file.go
@@ -114,7 +114,7 @@ func (f *fileOperate) SetOpenFlag(flagList ...int) *fileOperate {
 func (f *fileOperate) SetClearHasContentForWrite() *fileOperate {
 	f.clearHasContent = true
 	f.openFlag = f.openFlag | os.O_TRUNC
-	return nil
+	return f
 }
 
 // Create 创建文件