diff --git a/frontend/src/components/common/BaseDialog.vue b/frontend/src/components/common/BaseDialog.vue
index e24c6fc226..ba0fe6a051 100644
--- a/frontend/src/components/common/BaseDialog.vue
+++ b/frontend/src/components/common/BaseDialog.vue
@@ -44,6 +44,7 @@
 
 <script lang="ts">
 let dialogIdCounter = 0
+const openDialogs = new Set<string>()
 </script>
 
 <script setup lang="ts">
@@ -115,6 +116,12 @@ const handleEscape = (event: KeyboardEvent) => {
   }
 }
 
+const updateScrollLock = (isOpen: boolean) => {
+  if (isOpen) openDialogs.add(dialogId)
+  else openDialogs.delete(dialogId)
+  document.body.classList.toggle('modal-open', openDialogs.size > 0)
+}
+
 // Prevent body scroll when modal is open and manage focus
 watch(
   () => props.show,
@@ -123,7 +130,7 @@ watch(
       // 保存当前焦点元素
       previousActiveElement = document.activeElement as HTMLElement
       // 使用CSS类而不是直接操作style,更易于管理多个对话框
-      document.body.classList.add('modal-open')
+      updateScrollLock(true)
 
       // 等待DOM更新后设置焦点到对话框
       await nextTick()
@@ -137,7 +144,7 @@ watch(
         firstFocusable?.focus()
       }
     } else {
-      document.body.classList.remove('modal-open')
+      updateScrollLock(false)
       // 恢复之前的焦点
       if (previousActiveElement && typeof previousActiveElement.focus === 'function') {
         previousActiveElement.focus()
@@ -155,6 +162,6 @@ onMounted(() => {
 onUnmounted(() => {
   document.removeEventListener('keydown', handleEscape)
   // 确保组件卸载时移除滚动锁定
-  document.body.classList.remove('modal-open')
+  updateScrollLock(false)
 })
 </script>
diff --git a/frontend/src/components/common/__tests__/BaseDialog.scrollLock.spec.ts b/frontend/src/components/common/__tests__/BaseDialog.scrollLock.spec.ts
new file mode 100644
index 0000000000..3e4182f3c2
--- /dev/null
+++ b/frontend/src/components/common/__tests__/BaseDialog.scrollLock.spec.ts
@@ -0,0 +1,51 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { enableAutoUnmount, mount } from '@vue/test-utils'
+import BaseDialog from '../BaseDialog.vue'
+
+enableAutoUnmount(afterEach)
+
+function dialog(show = true) {
+  return mount(BaseDialog, { props: { show, title: 'Details' }, global: { stubs: { Icon: true } } })
+}
+
+const locked = () => document.body.classList.contains('modal-open')
+
+describe('dialog body scroll lock', () => {
+  it('keeps the body locked when a hidden sibling mounts or unmounts', () => {
+    dialog()
+    const hidden = dialog(false)
+    expect(locked()).toBe(true)
+    hidden.unmount()
+    expect(locked()).toBe(true)
+  })
+
+  it('keeps the lock until the last visible dialog closes', async () => {
+    const first = dialog()
+    const second = dialog()
+    await second.setProps({ show: false })
+    expect(locked()).toBe(true)
+    await first.setProps({ show: false })
+    expect(locked()).toBe(false)
+  })
+
+  it('keeps the lock until the last visible dialog unmounts', () => {
+    const first = dialog()
+    const second = dialog()
+    second.unmount()
+    expect(locked()).toBe(true)
+    first.unmount()
+    expect(locked()).toBe(false)
+  })
+
+  it('releases the lock after repeated open and close cycles', async () => {
+    const wrapper = dialog(false)
+    expect(locked()).toBe(false)
+    await wrapper.setProps({ show: true })
+    expect(locked()).toBe(true)
+    await wrapper.setProps({ show: false })
+    expect(locked()).toBe(false)
+    await wrapper.setProps({ show: true })
+    wrapper.unmount()
+    expect(locked()).toBe(false)
+  })
+})