diff --git a/docs/changelog/index.md b/docs/changelog/index.md
index a17b3353..6af90d45 100644
--- a/docs/changelog/index.md
+++ b/docs/changelog/index.md
@@ -31,7 +31,7 @@ sidebar: false
 
 - 站点流量限制语义调整为空或 `0` 继承全局默认、`-1` 关闭、大于 `0` 自定义；修改全局默认后需发布配置版本生效。
 - Agent Docker 部署命令默认挂载命名卷 `openflare-agent-pages` 持久化 Pages 目录，重建容器时无需重新拉取静态站点包。
-- 限流页新增「分析」视图：默认展示近 24 小时请求压力（RPS）与独立访客双轴趋势（1 分钟桶），支持域名过滤与 24 小时/3 天预设，并按窗口平均 RPS 排行域名与 IP；原全局默认配置迁入「配置」页签。
+- 限流页新增「分析」视图：默认展示近 24 小时请求压力（RPS）与独立访客双轴趋势（3 分钟桶），支持域名过滤与 24 小时/3 天预设，并按窗口平均 RPS 排行域名与 IP；原全局默认配置迁入「配置」页签。
 
 ### 修复
 
diff --git a/frontend/app/(main)/rate-limits/components/rate-pressure-chart.tsx b/frontend/app/(main)/rate-limits/components/rate-pressure-chart.tsx
index 1588418a..33d1b26e 100644
--- a/frontend/app/(main)/rate-limits/components/rate-pressure-chart.tsx
+++ b/frontend/app/(main)/rate-limits/components/rate-pressure-chart.tsx
@@ -14,7 +14,7 @@ import {
   type RateLimitRangeHours,
 } from '../../access-logs/components/access-log-utils';
 
-const DEFAULT_BUCKET_SECONDS = 60;
+const DEFAULT_BUCKET_SECONDS = 180;
 const RPS_COLOR = '#38bdf8';
 const VISITS_COLOR = '#a78bfa';
 
@@ -61,7 +61,7 @@ export function RatePressureChart({ data, hours }: RatePressureChartProps) {
   const bucketSeconds =
     (data?.bucket_minutes && data.bucket_minutes > 0
       ? data.bucket_minutes
-      : 1) * 60 || DEFAULT_BUCKET_SECONDS;
+      : 3) * 60 || DEFAULT_BUCKET_SECONDS;
 
   const rangeLabel = useMemo(() => {
     const end = data?.generated_at ? new Date(data.generated_at) : new Date();
diff --git a/frontend/app/(main)/rate-limits/page.tsx b/frontend/app/(main)/rate-limits/page.tsx
index 6ecae144..4eeef282 100644
--- a/frontend/app/(main)/rate-limits/page.tsx
+++ b/frontend/app/(main)/rate-limits/page.tsx
@@ -31,12 +31,12 @@ function RateLimitsPageContent() {
   const [hosts, setHosts] = useState<string[]>([]);
 
   const overviewQuery = useQuery({
-    queryKey: ['openflare', 'rate-limits', 'overview', hours, hosts, 1],
+    queryKey: ['openflare', 'rate-limits', 'overview', hours, hosts, 3],
     queryFn: () =>
       AccessLogService.getOverview({
         hours,
         hosts: hosts.length > 0 ? hosts : undefined,
-        bucket_minutes: 1,
+        bucket_minutes: 3,
       }),
     enabled: !!user?.is_admin && tab === 'analysis',
   });
diff --git a/internal/apps/openflare/observability/access_log_logics.go b/internal/apps/openflare/observability/access_log_logics.go
index 59cd3b04..6b81a381 100644
--- a/internal/apps/openflare/observability/access_log_logics.go
+++ b/internal/apps/openflare/observability/access_log_logics.go
@@ -374,7 +374,7 @@ func normalizeAccessLogOverviewQuery(input AccessLogOverviewQuery) AccessLogOver
 
 func normalizeAccessLogOverviewBucketMinutes(value int) int {
 	switch value {
-	case 1, 5, 60:
+	case 1, 3, 5, 60:
 		return value
 	default:
 		return defaultAccessLogOverviewBucketMinutes
diff --git a/internal/apps/openflare/observability/routers.go b/internal/apps/openflare/observability/routers.go
index 2cb08356..8bd61d56 100644
--- a/internal/apps/openflare/observability/routers.go
+++ b/internal/apps/openflare/observability/routers.go
@@ -22,7 +22,7 @@ import (
 // @Param host query string false "请求 Host（单域名）"
 // @Param hosts query []string false "请求 Host 列表（多域名精确匹配）"
 // @Param hours query int false "统计时间范围（小时）"
-// @Param bucket_minutes query int false "趋势桶分钟数（1、5 或 60，默认 60）"
+// @Param bucket_minutes query int false "趋势桶分钟数（1、3、5 或 60，默认 60）"
 // @Success 200 {object} response.Any{data=observability.AccessLogOverview} "访问日志概览"
 // @Failure 400 {object} response.Any "参数错误"
 // @Failure 401 {object} response.Any "未登录"