diff --git a/src/core/helper/adaptSysMessageDecoder.ts b/src/core/helper/adaptSysMessageDecoder.ts
deleted file mode 100644
index 6bd9122a..00000000
--- a/src/core/helper/adaptSysMessageDecoder.ts
+++ /dev/null
@@ -1,49 +0,0 @@
-// TODO: further refactor in NapCat.Packet v2
-import { NapProtoMsg, ProtoField, ScalarType } from "@napneko/nap-proto-core";
-
-const BodyInner = {
-    msgType: ProtoField(1, ScalarType.UINT32, true),
-    subType: ProtoField(2, ScalarType.UINT32, true)
-};
-
-const NoifyData = {
-    skip: ProtoField(1, ScalarType.BYTES, true),
-    innerData: ProtoField(2, ScalarType.BYTES, true)
-};
-
-const MsgHead = {
-    bodyInner: ProtoField(2, () => BodyInner, true),
-    noifyData: ProtoField(3, () => NoifyData, true)
-};
-
-const Message = {
-    msgHead: ProtoField(1, () => MsgHead)
-};
-
-const SubDetail = {
-    msgSeq: ProtoField(1, ScalarType.UINT32),
-    msgTime: ProtoField(2, ScalarType.UINT32),
-    senderUid: ProtoField(6, ScalarType.STRING)
-};
-
-const RecallDetails = {
-    operatorUid: ProtoField(1, ScalarType.STRING),
-    subDetail: ProtoField(3, () => SubDetail)
-};
-
-const RecallGroup = {
-    type: ProtoField(1, ScalarType.INT32),
-    peerUid: ProtoField(4, ScalarType.UINT32),
-    recallDetails: ProtoField(11, () => RecallDetails),
-    grayTipsSeq: ProtoField(37, ScalarType.UINT32)
-};
-
-export function decodeMessage(buffer: Uint8Array) {
-    const msg = new NapProtoMsg(Message);
-    return msg.decode(buffer);
-}
-
-export function decodeRecallGroup(buffer: Uint8Array){
-    const msg = new NapProtoMsg(RecallGroup);
-    return msg.decode(buffer);
-}