diff --git a/pkg/proto/friend/validate.go b/pkg/proto/friend/validate.go
new file mode 100644
index 000000000..aea3d09e5
--- /dev/null
+++ b/pkg/proto/friend/validate.go
@@ -0,0 +1,11 @@
+package friend
+
+import "github.com/OpenIMSDK/Open-IM-Server/pkg/errs"
+
+func (m *ApplyToAddFriendReq) Check() error {
+	*m = ApplyToAddFriendReq{}
+	if m.GetToUserID() == "" {
+		return errs.ErrArgs.Wrap("get toUserID is empty")
+	}
+	return nil
+}