diff --git a/app/(tabs)/challenges.tsx b/app/(tabs)/challenges.tsx
index 5fe88a4..f338b2b 100644
--- a/app/(tabs)/challenges.tsx
+++ b/app/(tabs)/challenges.tsx
@@ -1,5 +1,4 @@
 import ChallengeProgressCard from '@/components/challenges/ChallengeProgressCard';
-import { IconSymbol } from '@/components/ui/IconSymbol';
 import { Colors } from '@/constants/Colors';
 import { useAppDispatch, useAppSelector } from '@/hooks/redux';
 import { useColorScheme } from '@/hooks/useColorScheme';
@@ -127,7 +126,7 @@ export default function ChallengesScreen() {
               <Text style={[styles.title, { color: colorTokens.text }]}>挑战</Text>
               <Text style={[styles.subtitle, { color: colorTokens.textSecondary }]}>参与精选活动，保持每日动力</Text>
             </View>
-            <TouchableOpacity activeOpacity={0.9} style={styles.giftShadow}>
+            {/* <TouchableOpacity activeOpacity={0.9} style={styles.giftShadow}>
               <LinearGradient
                 colors={[colorTokens.primary, colorTokens.accentPurple]}
                 start={{ x: 0, y: 0 }}
@@ -136,7 +135,7 @@ export default function ChallengesScreen() {
               >
                 <IconSymbol name="gift.fill" size={18} color={colorTokens.onPrimary} />
               </LinearGradient>
-            </TouchableOpacity>
+            </TouchableOpacity> */}
           </View>
 
           {ongoingChallenge ? (
diff --git a/app/challenges/[id].tsx b/app/challenges/[id].tsx
index c679fd7..ebbf660 100644
--- a/app/challenges/[id].tsx
+++ b/app/challenges/[id].tsx
@@ -139,6 +139,7 @@ export default function ChallengeDetailScreen() {
   const progress = challenge?.progress;
 
   const rankingData = useMemo(() => challenge?.rankings ?? [], [challenge?.rankings]);
+
   const participantAvatars = useMemo(
     () => rankingData.filter((item) => item.avatar).map((item) => item.avatar as string).slice(0, 6),
     [rankingData],
@@ -296,11 +297,11 @@ export default function ChallengeDetailScreen() {
             tone="light"
             transparent
             withSafeTop={false}
-            right={
-              <TouchableOpacity style={styles.circularButton} activeOpacity={0.85} onPress={handleShare}>
-                <Ionicons name="share-social-outline" size={20} color="#ffffff" />
-              </TouchableOpacity>
-            }
+          // right={
+          //   <TouchableOpacity style={styles.circularButton} activeOpacity={0.85} onPress={handleShare}>
+          //     <Ionicons name="share-social-outline" size={20} color="#ffffff" />
+          //   </TouchableOpacity>
+          // }
           />
         </View>
 
diff --git a/services/backgroundTaskManager.ts b/services/backgroundTaskManager.ts
index 9bad20c..fa0a3a5 100644
--- a/services/backgroundTaskManager.ts
+++ b/services/backgroundTaskManager.ts
@@ -1,7 +1,8 @@
 import { store } from '@/store';
 import AsyncStorage from '@/utils/kvStore';
 import { log } from '@/utils/logger';
-import { StandReminderHelpers, WaterNotificationHelpers } from '@/utils/notificationHelpers';
+import { listChallenges } from '@/services/challengesApi';
+import { ChallengeNotificationHelpers, StandReminderHelpers, WaterNotificationHelpers } from '@/utils/notificationHelpers';
 import * as BackgroundTask from 'expo-background-task';
 import * as TaskManager from 'expo-task-manager';
 import { TaskManagerTaskBody } from 'expo-task-manager';
@@ -99,6 +100,55 @@ async function executeStandReminderTask(): Promise<void> {
   }
 }
 
+async function executeChallengeReminderTask(): Promise<void> {
+  try {
+    console.log('执行挑战鼓励提醒后台任务...');
+
+    const state = store.getState();
+    const normalizedUserName = state.user.profile?.name?.trim();
+    const userName = normalizedUserName && normalizedUserName.length > 0 ? normalizedUserName : '朋友';
+
+    const challenges = await listChallenges();
+    const joinedChallenges = challenges.filter((challenge) => challenge.isJoined && challenge.progress);
+
+    if (!joinedChallenges.length) {
+      console.log('没有加入的挑战或挑战没有进度，跳过挑战提醒');
+      return;
+    }
+
+    const todayKey = new Date().toISOString().slice(0, 10);
+
+    for (const challenge of joinedChallenges) {
+      const progress = challenge.progress;
+      if (!progress || progress.checkedInToday) {
+        continue;
+      }
+
+      const storageKey = `@challenge_encouragement_sent:${challenge.id}`;
+      const lastSent = await AsyncStorage.getItem(storageKey);
+      if (lastSent === todayKey) {
+        continue;
+      }
+
+      try {
+        await ChallengeNotificationHelpers.sendEncouragementNotification({
+          userName,
+          challengeTitle: challenge.title,
+          challengeId: challenge.id,
+        });
+
+        await AsyncStorage.setItem(storageKey, todayKey);
+      } catch (notificationError) {
+        console.error('发送挑战鼓励通知失败:', notificationError);
+      }
+    }
+
+    console.log('挑战鼓励提醒后台任务完成');
+  } catch (error) {
+    console.error('执行挑战鼓励提醒后台任务失败:', error);
+  }
+}
+
 // 发送测试通知以验证后台任务执行
 async function sendTestNotification(): Promise<void> {
   try {
@@ -149,6 +199,8 @@ async function executeBackgroundTasks(): Promise<void> {
     // 执行站立提醒检查任务
     // await executeStandReminderTask();
 
+    await executeChallengeReminderTask();
+
     console.log('后台任务执行完成');
   } catch (error) {
     console.error('执行后台任务失败:', error);
diff --git a/services/challengesApi.ts b/services/challengesApi.ts
index f6ec29d..5be96a7 100644
--- a/services/challengesApi.ts
+++ b/services/challengesApi.ts
@@ -6,6 +6,7 @@ export type ChallengeProgressDto = {
   completed: number;
   target: number;
   remaining: number
+  checkedInToday: boolean;
 };
 
 export type RankingItemDto = {
diff --git a/services/notifications.ts b/services/notifications.ts
index e58d740..8a193ad 100644
--- a/services/notifications.ts
+++ b/services/notifications.ts
@@ -161,6 +161,10 @@ export class NotificationService {
       if (data?.url) {
         router.push(data.url as any);
       }
+    } else if (data?.type === NotificationTypes.CHALLENGE_ENCOURAGEMENT) {
+      console.log('用户点击了挑战提醒通知', data);
+      const targetUrl = (data?.url as string) || '/(tabs)/challenges';
+      router.push(targetUrl as any);
     } else if (data?.type === 'mood_reminder') {
       // 处理心情提醒通知
       console.log('用户点击了心情提醒通知', data);
@@ -506,6 +510,7 @@ export const NotificationTypes = {
   MOOD_REMINDER: 'mood_reminder',
   WATER_REMINDER: 'water_reminder',
   REGULAR_WATER_REMINDER: 'regular_water_reminder',
+  CHALLENGE_ENCOURAGEMENT: 'challenge_encouragement',
 } as const;
 
 // 便捷方法
diff --git a/utils/notificationHelpers.ts b/utils/notificationHelpers.ts
index 626d8e1..6029ea6 100644
--- a/utils/notificationHelpers.ts
+++ b/utils/notificationHelpers.ts
@@ -1,5 +1,5 @@
 import * as Notifications from 'expo-notifications';
-import { NotificationData, notificationService } from '../services/notifications';
+import { NotificationData, NotificationTypes, notificationService } from '../services/notifications';
 import { getNotificationEnabled } from './userPreferences';
 
 /**
@@ -287,6 +287,33 @@ export class GoalNotificationHelpers {
   }
 }
 
+export class ChallengeNotificationHelpers {
+  static buildChallengesTabUrl(): string {
+    return '/(tabs)/challenges';
+  }
+
+  static async sendEncouragementNotification(params: {
+    userName: string;
+    challengeTitle: string;
+    challengeId: string;
+  }): Promise<string> {
+    const { userName, challengeTitle, challengeId } = params;
+    const notification: NotificationData = {
+      title: '挑战提醒',
+      body: `${userName}，今天还没有完成「${challengeTitle}」挑战，快来打卡吧！`,
+      data: {
+        type: NotificationTypes.CHALLENGE_ENCOURAGEMENT,
+        challengeId,
+        url: ChallengeNotificationHelpers.buildChallengesTabUrl(),
+      },
+      sound: true,
+      priority: 'high',
+    };
+
+    return notificationService.sendImmediateNotification(notification);
+  }
+}
+
 /**
  * 营养相关的通知辅助函数
  */