diff --git a/docs/changelog/index.md b/docs/changelog/index.md
index 303c1b68..52a047cf 100644
--- a/docs/changelog/index.md
+++ b/docs/changelog/index.md
@@ -22,6 +22,10 @@ sidebar: false
 
 ## [unreleased]
 
+### 改进
+
+- 限流页请求压力图的 RPS 纵轴改为按当前时段最高值的 1.5 倍动态缩放，避免低流量时刻度过大、高流量时被裁切。
+
 ## [v3.4.2] - 2026-07-19
 
 ### 新增
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 33d1b26e..ca3002a4 100644
--- a/frontend/app/(main)/rate-limits/components/rate-pressure-chart.tsx
+++ b/frontend/app/(main)/rate-limits/components/rate-pressure-chart.tsx
@@ -95,7 +95,13 @@ export function RatePressureChart({ data, hours }: RatePressureChartProps) {
   }, [bucketSeconds, data?.trends.requests, data?.trends.visits, hours]);
 
   const option = useMemo<EChartsOption>(() => {
-    const rpsMax = calculateNiceAxisMax(chartModel.rpsValues);
+    const rpsPeak = Math.max(
+      0,
+      ...chartModel.rpsValues.map((value) =>
+        Number.isFinite(value) && value > 0 ? value : 0,
+      ),
+    );
+    const rpsMax = rpsPeak > 0 ? rpsPeak * 1.5 : 1;
     const visitMax = calculateNiceAxisMax(chartModel.visitValues);
 
     return {