diff --git a/frontend/web/src/api.ts b/frontend/web/src/api.ts
index 53f3d1a..34ea973 100644
--- a/frontend/web/src/api.ts
+++ b/frontend/web/src/api.ts
@@ -264,9 +264,16 @@ export interface RunLogsResponse {
 
 export const reportsApi = {
   get: (runId: string) => api.get(`/reports/${runId}`),
-  html: (runId: string) => api.get(`/reports/${runId}/html`),
-  json: (runId: string) => api.get(`/reports/${runId}/json`),
-  markdownUrl: (runId: string) => `/api/reports/${runId}/markdown`,
+  download: async (runId: string, format: 'html' | 'json' | 'markdown') => {
+    const ext = format === 'markdown' ? 'md' : format
+    const res = await api.get(`/reports/${runId}/${format}`, { responseType: 'blob' })
+    const url = URL.createObjectURL(res.data as Blob)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = `report-${runId.slice(0, 8)}.${ext}`
+    a.click()
+    URL.revokeObjectURL(url)
+  },
   compare: (run1: string, run2: string) =>
     api.get(`/reports/compare`, { params: { run1, run2 } }),
 }
diff --git a/frontend/web/src/pages/Reports.tsx b/frontend/web/src/pages/Reports.tsx
index d3335f2..b314f6a 100644
--- a/frontend/web/src/pages/Reports.tsx
+++ b/frontend/web/src/pages/Reports.tsx
@@ -325,10 +325,10 @@ export default function ReportsPage() {
 
           {viewMode === 'single' && report && (
             <Space style={{ flexShrink: 0 }}>
-              <Button icon={<DownloadOutlined />} onClick={() => window.open(`/api/reports/${selectedRunId}/html`, '_blank')}>
+              <Button icon={<DownloadOutlined />} onClick={() => reportsApi.download(selectedRunId, 'html')}>
                 导出 HTML
               </Button>
-              <Button icon={<FileMarkdownOutlined />} onClick={() => window.open(reportsApi.markdownUrl(selectedRunId), '_blank')}>
+              <Button icon={<FileMarkdownOutlined />} onClick={() => reportsApi.download(selectedRunId, 'markdown')}>
                 导出 MD
               </Button>
             </Space>
diff --git a/frontend/web/src/pages/Runs.tsx b/frontend/web/src/pages/Runs.tsx
index d818e5c..185db48 100644
--- a/frontend/web/src/pages/Runs.tsx
+++ b/frontend/web/src/pages/Runs.tsx
@@ -6,7 +6,7 @@ import {
 import {
   FileTextOutlined, PlayCircleOutlined, ReloadOutlined, StopOutlined,
 } from '@ant-design/icons'
-import { runsApi, scenariosApi, targetsApi, type Run, type Scenario, type Target } from '../api'
+import { reportsApi, runsApi, scenariosApi, targetsApi, type Run, type Scenario, type Target } from '../api'
 import RunList from '../components/RunList'
 import CaseBlock from '../components/CaseBlock'
 import RuleOverview from '../components/RuleOverview'
@@ -226,7 +226,7 @@ export default function RunsPage() {
               }
             }}
             onOpenReport={handleOpenReport}
-            onExportJson={(runId) => window.open(`/api/reports/${runId}/json`, '_blank')}
+            onExportJson={(runId) => reportsApi.download(runId, 'json')}
             onRerun={async () => {
               if (!session.run) return
               await startRun(session.run.target_id, session.run.scenario_id)