diff --git a/docs/project_context.md b/docs/project_context.md
index 8746bea..e59ded5 100644
--- a/docs/project_context.md
+++ b/docs/project_context.md
@@ -1,4 +1,9 @@
 # 项目上下文记录
+## 2026-05-21：增加下载完成提示弹窗
+
+- 数据表 CSV/XLSX 导出、历史数据压缩包下载和配置文件下载在下载流程完成后会弹出 Naive UI 成功对话框，使用绿色成功图标提示用户文件已下载完成。
+- 提示逻辑统一放在 `frontend/src/composables/downloadFeedback.ts`；桌面端会在 Tauri 原生保存流程确认写入后提示，用户取消保存时不弹完成提示，Web 端会在浏览器下载触发后提示。
+
 ## 2026-05-21：排查离线机器桌面端白屏
 
 - 运行时外链扫描确认：`frontend/src`、`app`、`src-tauri/src` 中没有 CDN、在线字体或外网业务接口；桌面端前端只访问本机 `http://127.0.0.1:9081` sidecar，`src-tauri/tauri.conf.json` 的 `https://schema.tauri.app/config/2` 只是编辑器/构建 schema，不参与用户机器运行。
diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
index 7adb15b..132caa0 100644
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -149,7 +149,7 @@ export function upload<T>(
   });
 }
 
-export async function download(url: string, body: unknown, filename: string): Promise<void> {
+export async function download(url: string, body: unknown, filename: string): Promise<boolean> {
   const headers = new Headers({ 'Content-Type': 'application/json' });
   const token = getToken();
   if (token) {
@@ -157,14 +157,13 @@ export async function download(url: string, body: unknown, filename: string): Pr
   }
 
   if (isTauriRuntime()) {
-    await downloadWithTauri({
+    return await downloadWithTauri({
       url: apiUrl(url),
       method: 'POST',
       filename,
       headers: headersToPairs(headers),
       body: JSON.stringify(body)
     });
-    return;
   }
 
   const response = await fetchWithRetry(apiUrl(url), {
@@ -178,10 +177,10 @@ export async function download(url: string, body: unknown, filename: string): Pr
     throw new ApiRequestError(error.message, response.status, error.detail);
   }
 
-  await saveBlobResponse(response, parseFilename(response.headers.get('content-disposition')) || filename);
+  return await saveBlobResponse(response, parseFilename(response.headers.get('content-disposition')) || filename);
 }
 
-export async function downloadGet(url: string, fallbackFilename: string): Promise<void> {
+export async function downloadGet(url: string, fallbackFilename: string): Promise<boolean> {
   const headers = new Headers();
   const token = getToken();
   if (token) {
@@ -189,13 +188,12 @@ export async function downloadGet(url: string, fallbackFilename: string): Promis
   }
 
   if (isTauriRuntime()) {
-    await downloadWithTauri({
+    return await downloadWithTauri({
       url: apiUrl(url),
       method: 'GET',
       filename: fallbackFilename,
       headers: headersToPairs(headers)
     });
-    return;
   }
 
   const response = await fetchWithRetry(apiUrl(url), { headers });
@@ -214,7 +212,7 @@ export async function downloadGet(url: string, fallbackFilename: string): Promis
   }
 
   const filename = parseFilename(response.headers.get('content-disposition')) || fallbackFilename;
-  await saveBlobResponse(response, filename);
+  return await saveBlobResponse(response, filename);
 }
 
 async function readError(response: Response): Promise<{ message: string; detail?: ApiErrorDetail }> {
@@ -249,7 +247,7 @@ function parseApiError(data: ApiError, fallback: string): { message: string; det
   };
 }
 
-async function saveBlobResponse(response: Response, filename: string): Promise<void> {
+async function saveBlobResponse(response: Response, filename: string): Promise<boolean> {
   const blob = await response.blob();
   const objectUrl = URL.createObjectURL(blob);
   const link = document.createElement('a');
@@ -257,12 +255,14 @@ async function saveBlobResponse(response: Response, filename: string): Promise<v
   link.download = filename;
   link.click();
   URL.revokeObjectURL(objectUrl);
+  return true;
 }
 
-async function downloadWithTauri(request: TauriDownloadRequest): Promise<void> {
+async function downloadWithTauri(request: TauriDownloadRequest): Promise<boolean> {
   try {
     const invoke = await getTauriInvoke();
-    await invoke<TauriDownloadResult>('download_to_file', { request });
+    const result = await invoke<TauriDownloadResult>('download_to_file', { request });
+    return result.saved;
   } catch (error) {
     throw parseTauriDownloadError(error);
   }
diff --git a/frontend/src/components/DatabasePanel.vue b/frontend/src/components/DatabasePanel.vue
index d7393ec..3bc1ae6 100644
--- a/frontend/src/components/DatabasePanel.vue
+++ b/frontend/src/components/DatabasePanel.vue
@@ -231,6 +231,7 @@ import {
 
 import { apiGet, apiPost, download } from '../api/client';
 import type { ApiMessage, DatabaseInfo, TableData, TableInfo } from '../types';
+import { showDownloadCompleteDialog } from '../composables/downloadFeedback';
 import { resetPageHeader, setPageHeader } from '../composables/pageHeader';
 
 type RowData = Record<string, unknown>;
@@ -483,14 +484,18 @@ async function downloadSelectedCsv() {
   if (!selectedCsvTable.value) return;
   if (downloadingFormat.value) return;
 
+  const filename = `${selectedCsvTable.value}.csv`;
   downloadingFormat.value = 'csv';
   try {
-    await download(
+    const completed = await download(
       '/api/download',
       { table_name: selectedCsvTable.value, format: 'csv' },
-      `${selectedCsvTable.value}.csv`
+      filename
     );
-    csvDialogVisible.value = false;
+    if (completed) {
+      csvDialogVisible.value = false;
+      showDownloadCompleteDialog(dialog, filename);
+    }
   } catch (error) {
     message.error(error instanceof Error ? error.message : '导出失败');
   } finally {
@@ -503,13 +508,17 @@ async function downloadSelectedXlsx() {
   if (downloadingFormat.value) return;
 
   downloadingFormat.value = 'xlsx';
+  const filename = selectedXlsxTables.value.length === 1 ? `${selectedXlsxTables.value[0]}.xlsx` : 'tables.xlsx';
   try {
-    await download(
+    const completed = await download(
       '/api/download',
       { table_names: selectedXlsxTables.value, format: 'xlsx' },
-      selectedXlsxTables.value.length === 1 ? `${selectedXlsxTables.value[0]}.xlsx` : 'tables.xlsx'
+      filename
     );
-    xlsxDialogVisible.value = false;
+    if (completed) {
+      xlsxDialogVisible.value = false;
+      showDownloadCompleteDialog(dialog, filename);
+    }
   } catch (error) {
     message.error(error instanceof Error ? error.message : '导出失败');
   } finally {
diff --git a/frontend/src/components/HistoryPanel.vue b/frontend/src/components/HistoryPanel.vue
index 1330f0c..3140c87 100644
--- a/frontend/src/components/HistoryPanel.vue
+++ b/frontend/src/components/HistoryPanel.vue
@@ -100,6 +100,7 @@ import { CopyOutline, DownloadOutline, FileTrayOutline, RefreshOutline, TrashOut
 
 import { apiGet, apiPost, download as downloadFile } from '../api/client';
 import type { CacheSize, HistoryDetail, HistoryRecord } from '../types';
+import { showDownloadCompleteDialog } from '../composables/downloadFeedback';
 import { resetPageHeader, setPageHeader } from '../composables/pageHeader';
 
 type LogLevel = 'default' | 'info' | 'success' | 'warning' | 'error';
@@ -184,8 +185,11 @@ async function downloadHistory(record: HistoryRecord) {
 
   downloadingRecordId.value = record.id;
   try {
-    await downloadFile('/api/history/download', { record_id: record.id }, `${record.id}.zip`);
-    message.success('历史数据下载已开始');
+    const filename = `${record.id}.zip`;
+    const completed = await downloadFile('/api/history/download', { record_id: record.id }, filename);
+    if (completed) {
+      showDownloadCompleteDialog(dialog, filename);
+    }
   } catch (error) {
     message.error(error instanceof Error ? error.message : '下载历史数据失败');
   } finally {
diff --git a/frontend/src/components/SettingsPanel.vue b/frontend/src/components/SettingsPanel.vue
index a7dc825..20883ba 100644
--- a/frontend/src/components/SettingsPanel.vue
+++ b/frontend/src/components/SettingsPanel.vue
@@ -312,11 +312,12 @@
 
 <script setup lang="ts">
 import { computed, onBeforeUnmount, onMounted, reactive, ref } from 'vue';
-import { useMessage, type SelectOption } from 'naive-ui';
+import { useDialog, useMessage, type SelectOption } from 'naive-ui';
 import { CloseOutline, CloudDownloadOutline, CloudUploadOutline } from '@vicons/ionicons5';
 
 import { apiGet, apiPost, downloadGet, upload } from '../api/client';
 import type { ApiMessage, AppConfig, HistoryRetentionConfig, RemoteDataConfig } from '../types';
+import { showDownloadCompleteDialog } from '../composables/downloadFeedback';
 import { resetPageHeader, setPageHeader } from '../composables/pageHeader';
 
 interface ExtractFieldConfig {
@@ -327,6 +328,7 @@ interface ExtractFieldConfig {
 }
 
 const message = useMessage();
+const dialog = useDialog();
 const configInput = ref<HTMLInputElement | null>(null);
 const configUpdate = ref('');
 const loading = ref(false);
@@ -661,7 +663,11 @@ async function changePassword() {
 
 async function downloadConfig() {
   try {
-    await downloadGet('/api/config/download', 'Configure.json');
+    const filename = 'Configure.json';
+    const completed = await downloadGet('/api/config/download', filename);
+    if (completed) {
+      showDownloadCompleteDialog(dialog, filename);
+    }
   } catch (error) {
     message.error(error instanceof Error ? error.message : '下载配置失败');
   }
diff --git a/frontend/src/composables/downloadFeedback.ts b/frontend/src/composables/downloadFeedback.ts
new file mode 100644
index 0000000..d7b56ac
--- /dev/null
+++ b/frontend/src/composables/downloadFeedback.ts
@@ -0,0 +1,21 @@
+interface DownloadDialog {
+  success(options: {
+    title: string;
+    content: string;
+    positiveText?: string;
+    closable?: boolean;
+    maskClosable?: boolean;
+  }): unknown;
+}
+
+export function showDownloadCompleteDialog(dialog: DownloadDialog, filename?: string): void {
+  const safeName = filename?.trim();
+
+  dialog.success({
+    title: '下载完成',
+    content: safeName ? `文件「${safeName}」已下载完成。` : '文件已下载完成。',
+    positiveText: '知道了',
+    closable: true,
+    maskClosable: true
+  });
+}