diff --git a/src/rooms/commands/DiscardCommand.ts b/src/rooms/commands/DiscardCommand.ts
index 238272a..3888823 100644
--- a/src/rooms/commands/DiscardCommand.ts
+++ b/src/rooms/commands/DiscardCommand.ts
@@ -43,7 +43,9 @@ export class DiscardCommand extends Command<CardGameState, { client: Client, car
             client && client.send('discard_card_s2c', {errcode: 4, errmsg: '出牌不符合规则'});
             return;
         }
-        this.state.cards.clear();
+        for (let [key, val] of this.state.cards) {
+            this.state.cards.delete(key);
+        }
         //停止出牌计时, 并更新player.extraTime;
         let elapsedTime = this.room.stopSchedule('draw_card');
         if (elapsedTime >= 0) {