diff --git a/src/challenges/challenges.service.ts b/src/challenges/challenges.service.ts
index 9d4b2e5..66475c2 100644
--- a/src/challenges/challenges.service.ts
+++ b/src/challenges/challenges.service.ts
@@ -75,7 +75,7 @@ export class ChallengesService {
       const completionTarget = challenge.minimumCheckInDays
       const participation = participationMap.get(challenge.id);
       const progress = participation
-        ? this.buildChallengeProgress(participation.progressValue, completionTarget)
+        ? this.buildChallengeProgress(participation.progressValue, completionTarget, participation.lastProgressAt)
         : undefined;
 
       return {
@@ -167,7 +167,7 @@ export class ChallengesService {
     const completionTarget = challenge.minimumCheckInDays
 
     const progress = participation
-      ? this.buildChallengeProgress(participation.progressValue, completionTarget)
+      ? this.buildChallengeProgress(participation.progressValue, completionTarget, participation.lastProgressAt)
       : undefined;
 
     const rankings: RankingItemDto[] = rankingsRaw.map((item, index) => {
@@ -245,7 +245,7 @@ export class ChallengesService {
       existing.leftAt = null;
       existing.lastProgressAt = null;
       await existing.save();
-      return this.buildChallengeProgress(existing.progressValue, completionTarget);
+      return this.buildChallengeProgress(existing.progressValue, completionTarget, existing.lastProgressAt);
     }
 
     const participant = await this.participantModel.create({
@@ -257,7 +257,7 @@ export class ChallengesService {
       joinedAt: new Date(),
     });
 
-    return this.buildChallengeProgress(participant.progressValue, completionTarget);
+    return this.buildChallengeProgress(participant.progressValue, completionTarget, participant.lastProgressAt);
   }
 
   async leaveChallenge(userId: string, challengeId: string): Promise<boolean> {
@@ -392,21 +392,28 @@ export class ChallengesService {
       });
 
 
-      return this.buildChallengeProgress(participant.progressValue, participant.targetValue);
+      return this.buildChallengeProgress(participant.progressValue, participant.targetValue, participant.lastProgressAt);
     } catch (error) {
       if (error instanceof UniqueConstraintError) {
-        return this.buildChallengeProgress(participant.progressValue, participant.targetValue);
+        return this.buildChallengeProgress(participant.progressValue, participant.targetValue, participant.lastProgressAt);
       }
       throw error;
     }
   }
 
-  private buildChallengeProgress(completed: number, target: number, unit = '天'): ChallengeProgressDto {
+  private buildChallengeProgress(
+    completed: number,
+    target: number,
+    lastProgressAt?: Date | string | null,
+    unit = '天',
+  ): ChallengeProgressDto {
     const remaining = Math.max(target - completed, 0);
+    const checkedInToday = lastProgressAt ? dayjs(lastProgressAt).isSame(dayjs(), 'day') : false;
     return {
       completed,
       target,
       remaining,
+      checkedInToday,
     };
   }
 
diff --git a/src/challenges/dto/challenge-progress.dto.ts b/src/challenges/dto/challenge-progress.dto.ts
index deb5fc3..8a5eac1 100644
--- a/src/challenges/dto/challenge-progress.dto.ts
+++ b/src/challenges/dto/challenge-progress.dto.ts
@@ -2,6 +2,7 @@ export interface ChallengeProgressDto {
   completed: number;
   target: number;
   remaining: number;
+  checkedInToday: boolean;
 }
 
 export interface RankingItemDto {