diff --git a/backend/services/daily_volume.go b/backend/services/daily_volume.go
index e85241d..dc38056 100644
--- a/backend/services/daily_volume.go
+++ b/backend/services/daily_volume.go
@@ -66,14 +66,41 @@ func CaptureDailyVolume(source *models.LogSource, day time.Time, partial bool) e
 		partial = true
 	}
 
-	// 只查总量（不带 namespace 条件），一次拿到该源当天的条数与体积
-	// 整天（24h）的 index/stats：大集群上比 15 分钟的查询慢得多，
-	// 实测 20s 会超时（这也是之前每日量接口卡 20s 的原因）。给 90s。
-	ctx, cancel := context.WithTimeout(context.Background(), 90*time.Second)
+	// ── 体积：index/volume_range（只读 TSDB chunk 元数据，不解码日志内容）──
+	// 实测同一条件 24 小时：index/stats 要 20s（遇超时），volume_range 111ms。
+	// 用户关心的"每日日志量"就是体积，所以主路径走它。
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
 	defer cancel()
-	stats, err := LokiStatsFor(ctx, source, `{namespace=~".+"}`, start, end)
-	if err != nil {
-		return err
+	buckets, volErr := LokiHistogram(ctx, source, `{namespace=~".+"}`, start, end)
+	var totalBytes int64
+	for _, b := range buckets {
+		switch v := b["count"].(type) {
+		case int64:
+			totalBytes += v
+		case float64:
+			totalBytes += int64(v)
+		}
+	}
+
+	// ── 条数：只能 index/stats，慢（整天约 20s）──
+	// 降级为"尽力而为"：拿不到就把条数留 0，绝不让它拖住体积入库。
+	// 前端图只画体积，条数缺失不影响可读性。
+	var totalEntries int64
+	entryCtx, entryCancel := context.WithTimeout(context.Background(), 25*time.Second)
+	if stats, err := LokiStatsFor(entryCtx, source, `{namespace=~".+"}`, start, end); err == nil {
+		totalEntries = stats.Entries
+		if totalBytes == 0 {
+			totalBytes = stats.Bytes
+		}
+	} else {
+		log.Printf("[daily-volume] %s 条数统计超时/失败（不影响体积）: %v", dateKey(day), err)
+	}
+	entryCancel()
+	if volErr != nil && totalBytes == 0 {
+		return volErr
+	}
+	if totalBytes == 0 {
+		return nil
 	}
 
 	date := dateKey(day)
@@ -95,8 +122,11 @@ func CaptureDailyVolume(source *models.LogSource, day time.Time, partial bool) e
 		}
 		// 同一天同源：覆盖（幂等）
 		if snap.Date == date && snap.SourceID == source.ID && snap.Namespace == "" {
-			snap.Bytes = stats.Bytes
-			snap.Entries = stats.Entries
+			snap.Bytes = totalBytes
+			// 条数拿不到时保留上一次的值，避免"一次超时把历史条数清零"
+			if totalEntries > 0 {
+				snap.Entries = totalEntries
+			}
 			snap.Partial = partial
 			snap.CapturedAt = time.Now()
 			db.RequestSave()
@@ -109,8 +139,8 @@ func CaptureDailyVolume(source *models.LogSource, day time.Time, partial bool) e
 		Date:       date,
 		SourceID:   source.ID,
 		Namespace:  "",
-		Bytes:      stats.Bytes,
-		Entries:    stats.Entries,
+		Bytes:      totalBytes,
+		Entries:    totalEntries,
 		Partial:    partial,
 		CapturedAt: time.Now(),
 	})
diff --git a/frontend/src/pages/analysis/components/DailyVolumeChart.tsx b/frontend/src/pages/analysis/components/DailyVolumeChart.tsx
index 36d9748..aa38ace 100644
--- a/frontend/src/pages/analysis/components/DailyVolumeChart.tsx
+++ b/frontend/src/pages/analysis/components/DailyVolumeChart.tsx
@@ -1,5 +1,5 @@
 import { memo, useMemo } from 'react'
-import { Area, AreaChart, CartesianGrid, ResponsiveContainer, Tooltip, XAxis, YAxis } from 'recharts'
+import { Bar, BarChart, Cell, CartesianGrid, ResponsiveContainer, Tooltip, XAxis, YAxis } from 'recharts'
 import { useTranslation } from 'react-i18next'
 import { Button } from '@/components/ui/button'
 import type { DailyVolumePoint } from '@/api/logs'
@@ -56,11 +56,11 @@ export const DailyVolumeChart = memo(function DailyVolumeChart({ points, days, o
       {hasData ? (
         <div className="h-64 w-full">
           <ResponsiveContainer width="100%" height="100%">
-            <AreaChart data={data} margin={{ top: 12, right: 16, bottom: 4, left: 0 }}>
+            <BarChart data={data} margin={{ top: 12, right: 16, bottom: 4, left: 0 }} barCategoryGap="18%">
               <defs>
-                <linearGradient id="dailyVolumeFill" x1="0" y1="0" x2="0" y2="1">
-                  <stop offset="0%" stopColor="hsl(var(--info))" stopOpacity={0.35} />
-                  <stop offset="100%" stopColor="hsl(var(--info))" stopOpacity={0.02} />
+                <linearGradient id="dailyVolumeBar" x1="0" y1="0" x2="0" y2="1">
+                  <stop offset="0%" stopColor="hsl(var(--info))" stopOpacity={0.95} />
+                  <stop offset="100%" stopColor="hsl(var(--info))" stopOpacity={0.45} />
                 </linearGradient>
               </defs>
               <CartesianGrid stroke="hsl(var(--border))" strokeDasharray="3 3" />
@@ -72,15 +72,18 @@ export const DailyVolumeChart = memo(function DailyVolumeChart({ points, days, o
                   return [`${formatBytes(value)}${partial ? ` · ${t('daily.inProgress')}` : ''}`, t('daily.seriesVolume')]
                 }}
               />
-              <Area
-                type="monotone"
-                dataKey="bytes"
-                stroke="hsl(var(--info))"
-                strokeWidth={2}
-                fill="url(#dailyVolumeFill)"
-                name={t('daily.seriesVolume')}
-              />
-            </AreaChart>
+              {/* 圆柱形柱子：顶部圆角 + 渐变，当天未结束的用空心区分 */}
+              <Bar dataKey="bytes" name={t('daily.seriesVolume')} radius={[6, 6, 0, 0]} maxBarSize={44}>
+                {data.map(item => (
+                  <Cell
+                    key={item.date}
+                    fill={item.partial ? 'hsl(var(--info) / 0.35)' : 'url(#dailyVolumeBar)'}
+                    stroke={item.partial ? 'hsl(var(--info))' : undefined}
+                    strokeDasharray={item.partial ? '3 3' : undefined}
+                  />
+                ))}
+              </Bar>
+            </BarChart>
           </ResponsiveContainer>
         </div>
       ) : (