diff --git a/frontend/pages/support-activity/components/ContributionList.vue b/frontend/pages/support-activity/components/ContributionList.vue
index 6151923..6418ad5 100644
--- a/frontend/pages/support-activity/components/ContributionList.vue
+++ b/frontend/pages/support-activity/components/ContributionList.vue
@@ -8,21 +8,21 @@
         v-for="(record, index) in records"
         :key="record.id"
         class="contribution-item"
-        :class="{ 'new-item': index === 0 && isNewRecord(record.id) }"
+        :class="{ 'new-item': index === 0, 'fading-out': record.fading }"
       >
         <image class="user-avatar" :src="record.user_avatar" mode="aspectFill" />
         <text class="user-nickname">{{ record.user_nickname }}</text>
         <text class="contribute-text">贡献了</text>
         <image class="item-icon" :src="record.item_icon" mode="aspectFill" />
         <text class="item-name">{{ record.item_name }}</text>
-        <text class="item-quantity">x{{ record.quantity }}</text>
+        <text class="item-quantity">x{{ record.combo_count > 1 ? record.combo_count : record.quantity }}</text>
       </view>
     </scroll-view>
   </view>
 </template>
 
 <script setup>
-import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
+import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { useContributionPolling } from '../composables/useContributionPolling.js'
 
 const props = defineProps({
@@ -32,40 +32,14 @@ const props = defineProps({
   }
 })
 
-const visible = ref(true)
 const isPageActive = ref(true)
-const newRecordIds = ref([])
 
 // 使用轮询 composable
-const { records, loading, error, start, stop, refresh } = useContributionPolling(
+const { records, visible, loading, error, start, stop, reset } = useContributionPolling(
   computed(() => props.activityId),
   isPageActive
 )
 
-// 判断记录是否为新记录（刚加入的）
-function isNewRecord(id) {
-  return newRecordIds.value.includes(id)
-}
-
-// 监听 records 变化，标记新记录
-watch(records, (newRecords, oldRecords) => {
-  if (newRecords.length > 0 && oldRecords) {
-    const newIds = newRecords.map(r => r.id)
-    const oldIds = oldRecords.map(r => r.id)
-
-    // 找出新增的记录ID
-    for (const id of newIds) {
-      if (!oldIds.includes(id)) {
-        newRecordIds.value.push(id)
-        // 2秒后移除新记录标记
-        setTimeout(() => {
-          newRecordIds.value = newRecordIds.value.filter(i => i !== id)
-        }, 2000)
-      }
-    }
-  }
-}, { deep: true })
-
 onMounted(() => {
   isPageActive.value = true
 })
@@ -77,7 +51,7 @@ onUnmounted(() => {
 
 // 暴露给父组件使用
 defineExpose({
-  refresh
+  reset
 })
 </script>
 
@@ -125,6 +99,10 @@ defineExpose({
   animation: slideIn 0.3s ease-out;
 }
 
+.fading-out {
+  animation: fadeOut 0.5s forwards;
+}
+
 .user-avatar {
   width: 48rpx;
   height: 48rpx;
@@ -186,4 +164,9 @@ defineExpose({
     transform: translateX(0);
   }
 }
+
+@keyframes fadeOut {
+  from { opacity: 1; }
+  to { opacity: 0; }
+}
 </style>
\ No newline at end of file
diff --git a/frontend/pages/support-activity/composables/useContributionPolling.js b/frontend/pages/support-activity/composables/useContributionPolling.js
index 8ddba82..df18828 100644
--- a/frontend/pages/support-activity/composables/useContributionPolling.js
+++ b/frontend/pages/support-activity/composables/useContributionPolling.js
@@ -5,7 +5,7 @@ import { getActivityContributionsLatestApi } from '@/utils/api.js'
  * 贡献轮询逻辑 composable
  * @param {Ref<string>} activityId - 活动ID
  * @param {boolean} isPageActive - 页面是否可见
- * @returns {Object} records, loading, error, start, stop, refresh
+ * @returns {Object} records, visible, loading, error, start, stop, reset
  */
 export function useContributionPolling(activityId, isPageActive) {
   const MAX_RECORDS = 5
@@ -13,22 +13,42 @@ export function useContributionPolling(activityId, isPageActive) {
   const RECORD_TTL = 5000 // 每条记录 5 秒后消失
 
   const records = ref([])
+  const visible = ref(true)
   const loading = ref(false)
   const error = ref(null)
 
-  let latestId = 0
+  let latestTimestamp = 0 // 当前列表中最新记录的时间戳
+  let latestId = 0 // 当前列表中最新记录的 ID（同时间戳内二次筛选用）
   let pollingTimer = null
   let isPolling = false
   const recordTimers = new Map()
 
   // 重置记录计时器
   function resetRecordTimer(record) {
+    // 清除已有定时器
     if (recordTimers.has(record.id)) {
       clearTimeout(recordTimers.get(record.id))
-    }
-    const timer = setTimeout(() => {
-      records.value = records.value.filter(r => r.id !== record.id)
       recordTimers.delete(record.id)
+    }
+    // 清除淡出状态（新数据到来时重置）
+    const target = records.value.find(r => r.id === record.id)
+    if (target) {
+      target.fading = false
+    }
+    // 设置新的消失定时器
+    const timer = setTimeout(() => {
+      // 标记为淡出状态
+      const target = records.value.find(r => r.id === record.id)
+      if (target) {
+        target.fading = true
+        // 等待动画完成后移除
+        setTimeout(() => {
+          records.value = records.value.filter(r => r.id !== record.id)
+          recordTimers.delete(record.id)
+        }, 500)
+      } else {
+        recordTimers.delete(record.id)
+      }
     }, RECORD_TTL)
     recordTimers.set(record.id, timer)
   }
@@ -38,7 +58,7 @@ export function useContributionPolling(activityId, isPageActive) {
     if (!activityId.value) return
 
     try {
-      const res = await getActivityContributionsLatestApi(activityId.value, latestId, 1)
+      const res = await getActivityContributionsLatestApi(activityId.value, latestTimestamp, latestId, 1)
 
       // 处理 code 不为 200 的情况（静默忽略）
       if (res.code !== 200) return
@@ -48,18 +68,19 @@ export function useContributionPolling(activityId, isPageActive) {
 
       const newRecord = newRecords[0]
 
-      // 检测到新记录（id > latestId）
-      if (newRecord.id > latestId) {
-        // 重置所有现有记录的计时器
-        records.value.forEach(resetRecordTimer)
+      // 检测到新记录（时间戳更新，或时间戳相同但 ID 更新）
+      const isNew = newRecord.created_at > latestTimestamp ||
+        (newRecord.created_at === latestTimestamp && newRecord.id > latestId)
 
+      if (isNew) {
+        // 重置所有现有记录的计时器（新数据到来，刷新列表）
+        records.value.forEach(resetRecordTimer)
         // 新记录插入到列表头部
         records.value = [newRecord, ...records.value].slice(0, MAX_RECORDS)
-
         // 为新记录启动消失计时器
         resetRecordTimer(newRecord)
-
-        // 更新 latestId
+        // 更新时间戳和 ID
+        latestTimestamp = newRecord.created_at
         latestId = newRecord.id
       }
     } catch (e) {
@@ -76,7 +97,7 @@ export function useContributionPolling(activityId, isPageActive) {
     error.value = null
 
     try {
-      const res = await getActivityContributionsLatestApi(activityId.value, 0, MAX_RECORDS)
+      const res = await getActivityContributionsLatestApi(activityId.value, 0, 0, MAX_RECORDS)
 
       if (res.code !== 200) {
         throw new Error(res.message || '获取贡献记录失败')
@@ -94,8 +115,11 @@ export function useContributionPolling(activityId, isPageActive) {
       // 为每条记录启动计时器
       newRecords.forEach(record => resetRecordTimer(record))
 
-      // 更新 latestId
-      latestId = newRecords.length > 0 ? newRecords[newRecords.length - 1].id : 0
+      // 更新 latestTimestamp 和 latestId
+      if (newRecords.length > 0) {
+        latestTimestamp = newRecords[0].created_at
+        latestId = newRecords[0].id
+      }
     } catch (e) {
       error.value = e.message || '获取贡献记录失败'
       console.error('[useContributionPolling] fetchAll error:', e)
@@ -110,42 +134,42 @@ export function useContributionPolling(activityId, isPageActive) {
     if (!activityId.value) return
 
     isPolling = true
-    latestId = 0
-
-    // 全量拉取首次
-    fetchAll()
-
-    // 启动定时轮询
+    // 如果 latestTimestamp 为 0，说明是首次或切换活动，清空列表
+    if (latestTimestamp === 0) {
+      records.value = []
+    }
+    fetchLatest()
     pollingTimer = setInterval(fetchLatest, POLL_INTERVAL)
   }
 
-  // 停止轮询
+  // 停止轮询（保留状态）
   function stop() {
     if (pollingTimer) {
       clearInterval(pollingTimer)
       pollingTimer = null
     }
-
-    // 清除所有计时器
+    // 停止所有记录的计时器
     recordTimers.forEach(timer => clearTimeout(timer))
     recordTimers.clear()
-
     isPolling = false
-    records.value = []
-    latestId = 0
+    // 不清空 records、latestTimestamp、latestId，保留状态以便恢复
   }
 
-  // 强制刷新（全量拉取）
-  function refresh() {
+  // 重置所有状态（切换活动时用）
+  function reset() {
     stop()
-    start()
+    latestTimestamp = 0
+    latestId = 0
+    records.value = []
   }
 
   // 监听页面可见性
   watch(isPageActive, (active) => {
     if (active) {
+      visible.value = true
       start()
     } else {
+      visible.value = false
       stop()
     }
   }, { immediate: true })
@@ -153,7 +177,7 @@ export function useContributionPolling(activityId, isPageActive) {
   // 监听 activityId 变化
   watch(activityId, (newId, oldId) => {
     if (newId !== oldId) {
-      stop()
+      reset()
       if (isPageActive.value && newId) {
         start()
       }
@@ -162,15 +186,16 @@ export function useContributionPolling(activityId, isPageActive) {
 
   // 组件卸载时清理
   onUnmounted(() => {
-    stop()
+    reset()
   })
 
   return {
     records,
+    visible,
     loading,
     error,
     start,
     stop,
-    refresh
+    reset
   }
 }
\ No newline at end of file