diff --git a/packages/core/src/ruler.ts b/packages/core/src/ruler.ts
index 600320b..8aefd96 100644
--- a/packages/core/src/ruler.ts
+++ b/packages/core/src/ruler.ts
@@ -2,7 +2,7 @@ import { getClosestTimesVal, nearestPixelVal } from '@suika/common';
 
 import { HALF_PI } from './constant';
 import { type SuikaEditor } from './editor';
-import { rotateInCanvas } from './utils';
+import { mergeIntervals, rotateInCanvas } from './utils';
 
 const getStepByZoom = (zoom: number) => {
   /**
@@ -55,6 +55,8 @@ class Ruler {
     ctx.fillRect(0, 0, viewportWidth, setting.get('rulerWidth'));
     ctx.fillRect(0, 0, setting.get('rulerWidth'), viewportHeight);
 
+    this.drawSelectArea();
+
     this.drawXRuler();
     this.drawYRuler();
 
@@ -79,6 +81,40 @@ class Ruler {
 
     ctx.restore();
   }
+  private drawSelectArea() {
+    const setting = this.editor.setting;
+    const ctx = this.editor.ctx;
+    const zoom = this.editor.zoomManager.getZoom();
+    const viewport = this.editor.viewportManager.getViewport();
+
+    const bboxes = this.editor.selectedElements
+      .getItems({
+        excludeLocked: true,
+      })
+      .map((item) => item.getBbox());
+
+    ctx.fillStyle = setting.get('rulerSelectedBgColor');
+    for (const [minX, maxX] of mergeIntervals(
+      bboxes.map(({ minX, maxX }) => [minX, maxX]),
+    )) {
+      ctx.fillRect(
+        (minX - viewport.x) * zoom,
+        0,
+        (maxX - minX) * zoom,
+        setting.get('rulerWidth'),
+      );
+    }
+    for (const [minY, maxY] of mergeIntervals(
+      bboxes.map(({ minY, maxY }) => [minY, maxY]),
+    )) {
+      ctx.fillRect(
+        0,
+        (minY - viewport.y) * zoom,
+        setting.get('rulerWidth'),
+        (maxY - minY) * zoom,
+      );
+    }
+  }
   private drawXRuler() {
     // 绘制刻度线和刻度值
     // 计算 x 轴起点和终点范围
diff --git a/packages/core/src/setting.ts b/packages/core/src/setting.ts
index 8e261e6..ab7e741 100644
--- a/packages/core/src/setting.ts
+++ b/packages/core/src/setting.ts
@@ -97,6 +97,7 @@ export class Setting {
     rulerBgColor: '#fff',
     rulerStroke: '#e6e6e6',
     rulerMarkStroke: '#c1c1c1',
+    rulerSelectedBgColor: '#e6f5ff',
     rulerWidth: 20, // 宽度
     rulerMarkSize: 4, // 刻度高度
 
diff --git a/packages/core/src/utils/geo.ts b/packages/core/src/utils/geo.ts
index b1e4f14..bfa4884 100644
--- a/packages/core/src/utils/geo.ts
+++ b/packages/core/src/utils/geo.ts
@@ -70,3 +70,17 @@ export const adjustSizeToKeepPolarSnap = (rect: IRect): IRect => {
   }
   return rect;
 };
+
+export const mergeIntervals = (intervals: [number, number][]) => {
+  intervals.sort(([a], [b]) => a - b);
+  const result: [number, number][] = [];
+  for (const [prev, next] of intervals) {
+    const cur = result.at(-1);
+    if (cur && cur[1] >= prev) {
+      cur[1] = Math.max(next, cur[1]);
+    } else {
+      result.push([prev, next]);
+    }
+  }
+  return result;
+};