diff --git a/frontend_nuxt/components/PostLottery.vue b/frontend_nuxt/components/PostLottery.vue
index 29d487685..125d04ab7 100644
--- a/frontend_nuxt/components/PostLottery.vue
+++ b/frontend_nuxt/components/PostLottery.vue
@@ -16,7 +16,7 @@
           <div class="prize-count">x {{ lottery.prizeCount }}</div>
         </div>
         <div class="prize-end-time prize-info-right">
-          <div v-if="!isMobile" class="prize-end-time-title">离结束还有</div>
+          <div v-if="!isMobile" class="prize-end-time-title"><i class="fas fa-stopwatch"></i>距离结束还有</div>
           <div class="prize-end-time-value">{{ countdown }}</div>
           <div v-if="!isMobile" class="join-prize-button-container-desktop">
             <div
@@ -84,6 +84,7 @@ import { getToken, authState } from '~/utils/auth'
 import { toast } from '~/main'
 import { useRuntimeConfig } from '#imports'
 import { useIsMobile } from '~/utils/screen'
+import { useCountdown } from '~/composables/useCountdown'
 
 const props = defineProps({
   lottery: { type: Object, required: true },
@@ -95,54 +96,14 @@ const isMobile = useIsMobile()
 const loggedIn = computed(() => authState.loggedIn)
 const lotteryParticipants = computed(() => props.lottery?.participants || [])
 const lotteryWinners = computed(() => props.lottery?.winners || [])
-const lotteryEnded = computed(() => {
-  if (!props.lottery || !props.lottery.endTime) return false
-  return new Date(props.lottery.endTime).getTime() <= Date.now()
-})
+// 倒计时和结束flg
+const { countdown, isEnded } = useCountdown(props.lottery?.endTime)
+const lotteryEnded = computed(() => isEnded.value)
 const hasJoined = computed(() => {
   if (!loggedIn.value) return false
   return lotteryParticipants.value.some((p) => p.id === Number(authState.userId))
 })
 
-const countdown = ref('00:00:00')
-let timer = null
-const updateCountdown = () => {
-  if (!props.lottery || !props.lottery.endTime) {
-    countdown.value = '00:00:00'
-    return
-  }
-  const diff = new Date(props.lottery.endTime).getTime() - Date.now()
-  if (diff <= 0) {
-    countdown.value = '00:00:00'
-    if (timer) {
-      clearInterval(timer)
-      timer = null
-    }
-    return
-  }
-  const h = String(Math.floor(diff / 3600000)).padStart(2, '0')
-  const m = String(Math.floor((diff % 3600000) / 60000)).padStart(2, '0')
-  const s = String(Math.floor((diff % 60000) / 1000)).padStart(2, '0')
-  countdown.value = `${h}:${m}:${s}`
-}
-const startCountdown = () => {
-  updateCountdown()
-  if (timer) clearInterval(timer)
-  timer = setInterval(updateCountdown, 1000)
-}
-watch(
-  () => props.lottery?.endTime,
-  () => {
-    if (props.lottery && props.lottery.endTime) startCountdown()
-  },
-)
-onMounted(() => {
-  if (props.lottery && props.lottery.endTime) startCountdown()
-})
-onBeforeUnmount(() => {
-  if (timer) clearInterval(timer)
-})
-
 const gotoUser = (id) => navigateTo(`/users/${id}`, { replace: true })
 
 const config = useRuntimeConfig()
diff --git a/frontend_nuxt/components/PostPoll.vue b/frontend_nuxt/components/PostPoll.vue
index fdfc7cc07..29bc4b687 100644
--- a/frontend_nuxt/components/PostPoll.vue
+++ b/frontend_nuxt/components/PostPoll.vue
@@ -34,7 +34,7 @@
             <div class="poll-option-title" v-else>单选</div>
 
             <div class="poll-left-time">
-              <div class="poll-left-time-title">离结束还有</div>
+              <div class="poll-left-time-title"><i class="fas fa-stopwatch"></i>距离结束还有</div>
               <div class="poll-left-time-value">{{ countdown }}</div>
             </div>
           </div>
@@ -107,7 +107,11 @@
         <i class="fas fa-stopwatch"></i> 投票已结束
       </div>
       <div v-else class="poll-option-hint">
-        <i class="fas fa-stopwatch"></i> 您已投票，等待结束查看结果
+        <div>您已投票，等待结束查看结果</div>
+        <div class="poll-left-time">
+          <div class="poll-left-time-title"><i class="fas fa-stopwatch"></i>距离结束还有</div>
+          <div class="poll-left-time-value">{{ countdown }}</div>
+        </div>
       </div>
     </div>
   </div>
@@ -118,6 +122,7 @@ import { ref, computed, watch, onMounted, onBeforeUnmount } from 'vue'
 import { getToken, authState } from '~/utils/auth'
 import { toast } from '~/main'
 import { useRuntimeConfig } from '#imports'
+import { useCountdown } from '~/composables/useCountdown'
 
 const props = defineProps({
   poll: { type: Object, required: true },
@@ -140,10 +145,9 @@ const pollPercentages = computed(() =>
       })
     : [],
 )
-const pollEnded = computed(() => {
-  if (!props.poll || !props.poll.endTime) return false
-  return new Date(props.poll.endTime).getTime() <= Date.now()
-})
+// 倒计时
+const { countdown, isEnded } = useCountdown(props.poll?.endTime)
+const pollEnded = computed(() => isEnded.value)
 const hasVoted = computed(() => {
   if (!loggedIn.value) return false
   return pollParticipants.value.some((p) => p.id === Number(authState.userId))
@@ -152,45 +156,6 @@ watch([hasVoted, pollEnded], ([voted, ended]) => {
   if (voted || ended) showPollResult.value = true
 })
 
-const countdown = ref('00:00:00')
-let timer = null
-const updateCountdown = () => {
-  if (!props.poll || !props.poll.endTime) {
-    countdown.value = '00:00:00'
-    return
-  }
-  const diff = new Date(props.poll.endTime).getTime() - Date.now()
-  if (diff <= 0) {
-    countdown.value = '00:00:00'
-    if (timer) {
-      clearInterval(timer)
-      timer = null
-    }
-    return
-  }
-  const h = String(Math.floor(diff / 3600000)).padStart(2, '0')
-  const m = String(Math.floor((diff % 3600000) / 60000)).padStart(2, '0')
-  const s = String(Math.floor((diff % 60000) / 1000)).padStart(2, '0')
-  countdown.value = `${h}:${m}:${s}`
-}
-const startCountdown = () => {
-  updateCountdown()
-  if (timer) clearInterval(timer)
-  timer = setInterval(updateCountdown, 1000)
-}
-watch(
-  () => props.poll?.endTime,
-  () => {
-    if (props.poll && props.poll.endTime) startCountdown()
-  },
-)
-onMounted(() => {
-  if (props.poll && props.poll.endTime) startCountdown()
-})
-onBeforeUnmount(() => {
-  if (timer) clearInterval(timer)
-})
-
 const gotoUser = (id) => navigateTo(`/users/${id}`, { replace: true })
 
 const config = useRuntimeConfig()
diff --git a/frontend_nuxt/composables/useCountdown.ts b/frontend_nuxt/composables/useCountdown.ts
new file mode 100644
index 000000000..9873499eb
--- /dev/null
+++ b/frontend_nuxt/composables/useCountdown.ts
@@ -0,0 +1,51 @@
+import { ref, onMounted, onBeforeUnmount } from 'vue'
+
+/**
+ * 通用倒计时 composable
+ * @param endTime 截止时间字符串或 Date 对象
+ * @returns { countdown, isEnded }
+ */
+export function useCountdown(endTime?: string | Date) {
+  const countdown = ref('')
+  const isEnded = ref(false)
+  let timer: ReturnType<typeof setInterval> | null = null
+
+  const update = () => {
+    if (!endTime) {
+      countdown.value = ''
+      isEnded.value = true
+      return
+    }
+    const diff = new Date(endTime).getTime() - Date.now()
+    if (diff <= 0) {
+      countdown.value = '已结束'
+      isEnded.value = true
+      if (timer) clearInterval(timer)
+      return
+    }
+    // 计算天、时、分、秒
+    const days = Math.floor(diff / (24 * 3600 * 1000))
+    const hours = Math.floor((diff % (24 * 3600 * 1000)) / 3600000)
+    const minutes = Math.floor((diff % 3600000) / 60000)
+    const seconds = Math.floor((diff % 60000) / 1000)
+
+    if (days > 0) {
+      countdown.value = `${days}天 ${hours}小时 ${minutes}分 ${seconds}秒`
+    } else if (hours > 0) {
+      countdown.value = `${hours}小时 ${minutes}分 ${seconds}秒`
+    } else {
+      countdown.value = `${minutes}分 ${seconds}秒`
+    }
+  }
+
+  onMounted(() => {
+    update()
+    timer = setInterval(update, 1000)
+  })
+
+  onBeforeUnmount(() => {
+    if (timer) clearInterval(timer)
+  })
+
+  return { countdown, isEnded }
+}