diff --git a/src/server/packets/SwapLineupCsReq.ts b/src/server/packets/SwapLineupCsReq.ts
new file mode 100644
index 0000000..f22c944
--- /dev/null
+++ b/src/server/packets/SwapLineupCsReq.ts
@@ -0,0 +1,21 @@
+import { SwapLineupCsReq, SwapLineupScRsp, SyncLineupNotify, SyncLineupReason } from "../../data/proto/StarRail";
+import Packet from "../kcp/Packet";
+import Session from "../kcp/Session";
+
+export default async function handle(session: Session, packet: Packet) {
+    const body = packet.body as SwapLineupCsReq;
+    session.send("SwapLineupScRsp", { retcode: 0 } as SwapLineupScRsp);
+
+    let lineup = await session.player.getLineup();
+    const _copy = lineup.avatarList[body.dstSlot];
+    lineup.avatarList[body.dstSlot] = lineup.avatarList[body.srcSlot];
+    lineup.avatarList[body.srcSlot] = _copy;
+
+    session.player.setLineup(lineup);
+    session.player.save();
+
+    session.send("SyncLineupNotify", {
+        lineup: lineup,
+        reasonList: [SyncLineupReason.SYNC_REASON_NONE]
+    } as SyncLineupNotify);
+}
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