diff --git a/src/robot/Robot.ts b/src/robot/Robot.ts
index 6109870..9ea162e 100644
--- a/src/robot/Robot.ts
+++ b/src/robot/Robot.ts
@@ -158,9 +158,13 @@ export class Robot {
      */
     @wait('maxDiscardTime')
     private async discard() {
+        let targetCard
+        if (this.room.state.cards.size == 1) {
+            targetCard =[...this.room.state.cards.values()][0];
+        }
         let self = this;
         let cardArr = [...self.player.cards.values()];
-        let cards = assistantUtil.checkTriple(cardArr);
+        let cards = assistantUtil.checkTriple(cardArr, targetCard);
         if (!cards) {
             return;
         }
@@ -168,7 +172,8 @@ export class Robot {
         // let cardIds = [cardArr[0].id]
         log(`discard: ${self.sessionId} ${cardIds}`);
         self.reply('discard_card_c2s', {
-            cards: cardIds
+            cards: cardIds,
+            target: targetCard.id
         });
     }
 
diff --git a/src/robot/RobotClient.ts b/src/robot/RobotClient.ts
index 78f7a7b..64de35c 100644
--- a/src/robot/RobotClient.ts
+++ b/src/robot/RobotClient.ts
@@ -135,16 +135,21 @@ export class RobotClient implements Client {
      */
     @wait('maxDiscardTime')
     private async discard() {
+        let targetCard
+        if (this.svrstate.cards.size == 1) {
+            targetCard =[...this.svrstate.cards.values()][0];
+        }
         let self = this;
         let cardArr = [...self.selfPlayer.cards.values()];
-        let cards = assistantUtil.checkTriple(cardArr);
+        let cards = assistantUtil.checkTriple(cardArr, targetCard);
         if (!cards) {
             return;
         }
         let cardIds = cards.map(o => o.id);
         log(`discard: ${self.sessionId} ${cardIds}`);
         self.reply('discard_card_c2s', {
-            cards: cardIds
+            cards: cardIds,
+            target: targetCard.id
         });
     }