diff --git a/admin/src/views/Dashboard.vue b/admin/src/views/Dashboard.vue
index 19650ad..3ad91de 100644
--- a/admin/src/views/Dashboard.vue
+++ b/admin/src/views/Dashboard.vue
@@ -27,6 +27,61 @@
       </el-col>
     </el-row>
 
+    <el-card v-if="bandwidth" class="bw-card" style="margin-top: 20px">
+      <template #header>
+        <div class="bw-header">
+          <span>应用带宽观测</span>
+          <el-text type="info" size="small">{{ bwUpdatedAt }}</el-text>
+        </div>
+      </template>
+      <el-alert type="info" :closable="false" show-icon class="bw-tip">
+        以下为<strong>本 Go 进程</strong>统计的 HTTP 请求/响应字节量，用于粗估负载；若前面还有 Nginx/CDN，<strong>公网出口带宽</strong>可能更高。WebSocket（如直播信令）升级后的流量可能未完全计入。
+      </el-alert>
+      <el-row :gutter="16" class="bw-row">
+        <el-col :xs="24" :sm="12" :md="6">
+          <div class="bw-metric">
+            <div class="bw-label">出站累计（用户下载为主）</div>
+            <div class="bw-value">{{ formatBytes(bandwidth.bytes_out_total) }}</div>
+          </div>
+        </el-col>
+        <el-col :xs="24" :sm="12" :md="6">
+          <div class="bw-metric">
+            <div class="bw-label">入站累计（上传/POST）</div>
+            <div class="bw-value">{{ formatBytes(bandwidth.bytes_in_total) }}</div>
+          </div>
+        </el-col>
+        <el-col :xs="24" :sm="12" :md="6">
+          <div class="bw-metric">
+            <div class="bw-label">近 60 秒出站 · 约 Mbps</div>
+            <div class="bw-value accent">{{ bandwidth.recent_egress_mbps }}</div>
+            <div class="bw-sub">{{ formatBytes(bandwidth.bytes_out_last_60s) }} / 60s</div>
+          </div>
+        </el-col>
+        <el-col :xs="24" :sm="12" :md="6">
+          <div class="bw-metric">
+            <div class="bw-label">自启动平均出站 · Mbps</div>
+            <div class="bw-value accent">{{ bandwidth.avg_egress_mbps }}</div>
+            <div class="bw-sub">运行 {{ formatUptime(bandwidth.uptime_seconds) }}</div>
+          </div>
+        </el-col>
+      </el-row>
+      <el-row :gutter="16" class="bw-row bw-row--second">
+        <el-col :xs="24" :sm="12">
+          <div class="bw-metric bw-metric--inline">
+            <span class="bw-label">近 60 秒入站约 Mbps</span>
+            <span class="bw-value-inline">{{ bandwidth.recent_ingress_mbps }}</span>
+            <span class="bw-sub">{{ formatBytes(bandwidth.bytes_in_last_60s) }} / 60s</span>
+          </div>
+        </el-col>
+        <el-col :xs="24" :sm="12">
+          <div class="bw-metric bw-metric--inline">
+            <span class="bw-label">自启动平均入站 · Mbps</span>
+            <span class="bw-value-inline">{{ bandwidth.avg_ingress_mbps }}</span>
+          </div>
+        </el-col>
+      </el-row>
+    </el-card>
+
     <el-card style="margin-top: 20px">
       <template #header>
         <span>快捷入口</span>
@@ -41,7 +96,7 @@
 </template>
 
 <script setup>
-import { reactive, ref, onMounted } from 'vue'
+import { reactive, ref, onMounted, onUnmounted, computed } from 'vue'
 import { getStats } from '../api/admin'
 
 const stats = reactive({
@@ -52,13 +107,51 @@ const stats = reactive({
   files: 0
 })
 
+const bandwidth = ref(null)
+const bwFetchAt = ref(0)
+
+const bwUpdatedAt = computed(() => {
+  if (!bwFetchAt.value) return ''
+  const d = new Date(bwFetchAt.value)
+  return `更新于 ${d.toLocaleTimeString()}`
+})
+
 const loading = ref(true)
 
+function formatBytes(n) {
+  if (n == null || !Number.isFinite(n) || n < 0) return '—'
+  if (n < 1024) return `${n} B`
+  const u = ['KB', 'MB', 'GB', 'TB']
+  let v = n
+  let i = -1
+  do {
+    v /= 1024
+    i++
+  } while (v >= 1024 && i < u.length - 1)
+  return `${v < 10 ? v.toFixed(2) : v.toFixed(1)} ${u[i]}`
+}
+
+function formatUptime(sec) {
+  if (sec == null || !Number.isFinite(sec) || sec < 0) return '—'
+  const s = Math.floor(sec)
+  const h = Math.floor(s / 3600)
+  const m = Math.floor((s % 3600) / 60)
+  const r = s % 60
+  if (h > 0) return `${h} 小时 ${m} 分`
+  if (m > 0) return `${m} 分 ${r} 秒`
+  return `${r} 秒`
+}
+
 const fetchStats = async () => {
   loading.value = true
   try {
     const res = await getStats()
-    Object.assign(stats, res)
+    const { bandwidth: bw, ...rest } = res
+    Object.assign(stats, rest)
+    if (bw && typeof bw === 'object') {
+      bandwidth.value = bw
+      bwFetchAt.value = Date.now()
+    }
   } catch (e) {
     console.error('获取统计失败:', e)
     // 即使失败也显示 0，不阻塞页面
@@ -67,7 +160,30 @@ const fetchStats = async () => {
   }
 }
 
-onMounted(fetchStats)
+let pollTimer = null
+
+onMounted(() => {
+  fetchStats()
+  pollTimer = window.setInterval(() => {
+    getStats()
+      .then((res) => {
+        const { bandwidth: bw, ...rest } = res
+        Object.assign(stats, rest)
+        if (bw && typeof bw === 'object') {
+          bandwidth.value = bw
+          bwFetchAt.value = Date.now()
+        }
+      })
+      .catch(() => {})
+  }, 8000)
+})
+
+onUnmounted(() => {
+  if (pollTimer != null) {
+    clearInterval(pollTimer)
+    pollTimer = null
+  }
+})
 </script>
 
 <style scoped>
@@ -85,4 +201,58 @@ onMounted(fetchStats)
   color: #666;
   font-size: 14px;
 }
+.bw-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  flex-wrap: wrap;
+}
+.bw-tip {
+  margin-bottom: 16px;
+}
+.bw-row {
+  margin-top: 0;
+}
+.bw-row--second {
+  margin-top: 12px;
+}
+.bw-metric {
+  padding: 12px 0;
+  border-bottom: 1px solid var(--el-border-color-lighter);
+}
+.bw-metric--inline {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: baseline;
+  gap: 8px 12px;
+  border-bottom: none;
+  padding: 8px 0;
+}
+.bw-label {
+  font-size: 13px;
+  color: #606266;
+  margin-bottom: 6px;
+}
+.bw-metric--inline .bw-label {
+  margin-bottom: 0;
+}
+.bw-value {
+  font-size: 22px;
+  font-weight: 600;
+  color: #303133;
+}
+.bw-value.accent {
+  color: #409eff;
+}
+.bw-value-inline {
+  font-size: 18px;
+  font-weight: 600;
+  color: #409eff;
+}
+.bw-sub {
+  font-size: 12px;
+  color: #909399;
+  margin-top: 4px;
+}
 </style>
diff --git a/admin/src/views/sites/LiveBroadcast.vue b/admin/src/views/sites/LiveBroadcast.vue
index 723d086..67a3305 100644
--- a/admin/src/views/sites/LiveBroadcast.vue
+++ b/admin/src/views/sites/LiveBroadcast.vue
@@ -91,7 +91,7 @@
 </template>
 
 <script setup>
-import { ref, computed, onMounted, onUnmounted } from 'vue'
+import { ref, computed, watch, onMounted, onUnmounted } from 'vue'
 import { onBeforeRouteLeave } from 'vue-router'
 import { useAuthStore } from '../../stores/auth'
 import { startPublishing } from '../../utils/liveWebRTC'
diff --git a/server/handlers/stats.go b/server/handlers/stats.go
index 7a611c0..6406b5d 100644
--- a/server/handlers/stats.go
+++ b/server/handlers/stats.go
@@ -8,6 +8,7 @@ import (
 	"go.mongodb.org/mongo-driver/v2/bson"
 
 	"yh_web/server/config"
+	"yh_web/server/pkg/traffic"
 
 	"github.com/gin-gonic/gin"
 )
@@ -30,5 +31,6 @@ func GetStats(c *gin.Context) {
 		"conversations": conversations,
 		"messages":      messages,
 		"files":         files,
+		"bandwidth":     traffic.Snapshot(),
 	})
 }
diff --git a/server/main.go b/server/main.go
index 50af5fc..97beae9 100644
--- a/server/main.go
+++ b/server/main.go
@@ -82,6 +82,7 @@ func main() {
 	r := gin.Default()
 	r.MaxMultipartMemory = 32 << 20 // 大单片先落临时文件；整体体积受 Nginx client_max_body_size 限制
 	r.Use(middleware.ErrorLogger())
+	r.Use(middleware.TrafficMeter())
 
 	// CORS（ALLOWED_ORIGINS 为空则允许所有来源；否则仅允许配置的域名）
 	allowedOriginsEnv := os.Getenv("ALLOWED_ORIGINS")
diff --git a/server/middleware/traffic_meter.go b/server/middleware/traffic_meter.go
new file mode 100644
index 0000000..a597093
--- /dev/null
+++ b/server/middleware/traffic_meter.go
@@ -0,0 +1,53 @@
+package middleware
+
+import (
+	"io"
+	"net/http"
+
+	"yh_web/server/pkg/traffic"
+
+	"github.com/gin-gonic/gin"
+)
+
+type countReadCloser struct {
+	io.ReadCloser
+}
+
+func (c *countReadCloser) Read(p []byte) (int, error) {
+	n, err := c.ReadCloser.Read(p)
+	if n > 0 {
+		traffic.AddIn(n)
+	}
+	return n, err
+}
+
+type meterResponseWriter struct {
+	gin.ResponseWriter
+}
+
+func (w *meterResponseWriter) Write(p []byte) (int, error) {
+	n, err := w.ResponseWriter.Write(p)
+	if n > 0 {
+		traffic.AddOut(n)
+	}
+	return n, err
+}
+
+func (w *meterResponseWriter) WriteString(s string) (int, error) {
+	n, err := w.ResponseWriter.WriteString(s)
+	if n > 0 {
+		traffic.AddOut(n)
+	}
+	return n, err
+}
+
+// TrafficMeter 统计 HTTP 请求体与响应体字节量（进程级，非网卡级）。
+func TrafficMeter() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if c.Request.Body != nil && c.Request.Body != http.NoBody {
+			c.Request.Body = &countReadCloser{ReadCloser: c.Request.Body}
+		}
+		c.Writer = &meterResponseWriter{ResponseWriter: c.Writer}
+		c.Next()
+	}
+}
diff --git a/server/pkg/traffic/meter.go b/server/pkg/traffic/meter.go
new file mode 100644
index 0000000..083b3b6
--- /dev/null
+++ b/server/pkg/traffic/meter.go
@@ -0,0 +1,108 @@
+// Package traffic 统计经过本进程的 HTTP 流量（请求体 + 响应体），供后台评估带宽。
+// 说明：前有 Nginx 时边缘出口可能更大；WebSocket 升级后部分流量可能不经此计数。
+package traffic
+
+import (
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+var (
+	totalIn  atomic.Uint64
+	totalOut atomic.Uint64
+	started  = time.Now()
+
+	tickerOnce sync.Once
+
+	mu          sync.Mutex
+	secIn       [60]uint64
+	secOut      [60]uint64
+	lastSnapIn  uint64
+	lastSnapOut uint64
+	tickIndex   int64
+)
+
+func ensureTicker() {
+	tickerOnce.Do(func() {
+		go func() {
+			t := time.NewTicker(time.Second)
+			defer t.Stop()
+			for range t.C {
+				tick()
+			}
+		}()
+	})
+}
+
+func tick() {
+	ti := totalIn.Load()
+	to := totalOut.Load()
+	mu.Lock()
+	i := int(tickIndex % 60)
+	secIn[i] = ti - lastSnapIn
+	secOut[i] = to - lastSnapOut
+	lastSnapIn = ti
+	lastSnapOut = to
+	tickIndex++
+	mu.Unlock()
+}
+
+// AddIn 记录请求体已读字节。
+func AddIn(n int) {
+	if n > 0 {
+		ensureTicker()
+		totalIn.Add(uint64(n))
+	}
+}
+
+// AddOut 记录响应已写字节。
+func AddOut(n int) {
+	if n > 0 {
+		ensureTicker()
+		totalOut.Add(uint64(n))
+	}
+}
+
+// Snapshot 返回当前统计（近 60 秒为滚动窗口内各秒增量之和）。
+func Snapshot() map[string]any {
+	ensureTicker()
+	tin := totalIn.Load()
+	tout := totalOut.Load()
+	up := time.Since(started).Seconds()
+
+	mu.Lock()
+	var sumIn, sumOut uint64
+	for i := 0; i < 60; i++ {
+		sumIn += secIn[i]
+		sumOut += secOut[i]
+	}
+	mu.Unlock()
+
+	var avgDown, avgUp, recentDown, recentUp float64
+	if up > 0.5 {
+		avgDown = float64(tout) * 8 / (up * 1e6) // Mbps 出站（自启动平均）
+		avgUp = float64(tin) * 8 / (up * 1e6)   // Mbps 入站
+	}
+	recentDown = float64(sumOut) * 8 / (60 * 1e6)
+	recentUp = float64(sumIn) * 8 / (60 * 1e6)
+
+	return map[string]any{
+		"bytes_in_total":       tin,
+		"bytes_out_total":      tout,
+		"bytes_in_last_60s":    sumIn,
+		"bytes_out_last_60s":   sumOut,
+		"uptime_seconds":       up,
+		"avg_egress_mbps":      round2(avgDown),
+		"avg_ingress_mbps":     round2(avgUp),
+		"recent_egress_mbps":   round2(recentDown),
+		"recent_ingress_mbps":  round2(recentUp),
+	}
+}
+
+func round2(x float64) float64 {
+	if x < 0 {
+		return 0
+	}
+	return float64(int64(x*100+0.5)) / 100
+}