diff --git a/src/rooms/commands/ChangeCardCommand.ts b/src/rooms/commands/ChangeCardCommand.ts
index 76b0b84..d8f895c 100644
--- a/src/rooms/commands/ChangeCardCommand.ts
+++ b/src/rooms/commands/ChangeCardCommand.ts
@@ -30,6 +30,11 @@ export class ChangeCardCommand extends Command<CardGameState, { client: Client,
             return;
         }
         const maxCount = singleton(GameEnv).roundDrawNum;
+        if (cards.length > maxCount) {
+            client.send('change_card_s2c', {errcode: 3, errmsg: '换卡数量超过限制'});
+            return;
+        }
+
         let cardToRemove:Card[] = [];
         for (let id of cards) {
             let card = player.cards.get(id + '');