diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0544dc1..a3bc20c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -126,6 +126,57 @@ jobs:
           name: MXU-win-${{ matrix.arch }}
           path: "install"
 
+      - name: Download WebView2 Fixed Version Runtime
+        shell: pwsh
+        run: |
+          # 从微软官方 CDN 下载 WebView2 Fixed Version Runtime
+          # 更新版本时需同步更新 $version 和 $guidMap 中的 GUID
+          # GUID 可在 https://developer.microsoft.com/en-us/microsoft-edge/webview2/ 页面从 Fixed Version 的下载链接中获取
+          # 或前往 Scoop 存储库查看 https://github.com/ScoopInstaller/Extras/blob/master/bucket/webview2.json
+          $version = '145.0.3800.65'
+          $archMap = @{ 'x86_64' = 'x64'; 'aarch64' = 'arm64' }
+          $guidMap = @{
+            'x64'   = 'c411606c-d282-4304-8420-8ae6b1dd3e9a'
+            'arm64' = '2d2cf37b-d24c-4c72-b5bc-e8061e7a7583'
+          }
+          $arch = $archMap['${{ matrix.arch }}']
+          $guid = $guidMap[$arch]
+          $cabName = "Microsoft.WebView2.FixedVersionRuntime.$version.$arch.cab"
+          $uri = "https://msedge.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/$guid/$cabName"
+
+          Write-Host "Downloading $cabName from Microsoft CDN ..."
+          Invoke-WebRequest -Uri $uri -OutFile $cabName -ErrorAction Stop
+
+          $tempDir = "temp_wv2"
+          New-Item -ItemType Directory -Force -Path $tempDir | Out-Null
+          expand.exe $cabName -F:* $tempDir
+          if ($LASTEXITCODE -ne 0) {
+            throw "Failed to extract $cabName with exit code $LASTEXITCODE"
+          }
+
+          $dest = "install\webview2_runtime"
+          New-Item -ItemType Directory -Force -Path $dest | Out-Null
+
+          # cab 解压后文件在版本子目录中，将其内容移动到 webview2_runtime/
+          $versionDir = Get-ChildItem $tempDir -Directory | Where-Object { $_.Name -like "Microsoft.WebView2*" } | Select-Object -First 1
+          if (-not $versionDir -and (Get-ChildItem $tempDir).Count -eq 0) {
+            throw "No files found after extracting $cabName"
+          }
+          if ($versionDir) {
+            Copy-Item -Path "$($versionDir.FullName)\*" -Destination $dest -Recurse -Force -ErrorAction Stop
+          } else {
+            Copy-Item -Path "$tempDir\*" -Destination $dest -Recurse -Force -ErrorAction Stop
+          }
+
+          Remove-Item $cabName, $tempDir -Recurse -Force
+          Write-Host "WebView2 Fixed Version Runtime $version ($arch) ready at $dest"
+
+      - name: Upload fixed-webview artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: MXU-win-${{ matrix.arch }}-fixed-webview
+          path: "install"
+
   linux:
     needs: meta
     runs-on: ubuntu-latest
diff --git a/src-tauri/src/main.rs b/src-tauri/src/main.rs
index 10cdf91..acc441b 100644
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -15,10 +15,22 @@ fn main() {
                 // 确保目录存在
                 let _ = std::fs::create_dir_all(&webview_data_dir);
                 std::env::set_var("WEBVIEW2_USER_DATA_FOLDER", &webview_data_dir);
+
+                // 检测内置的 WebView2 固定版本运行时
+                let webview2_runtime_dir = exe_dir.join("webview2_runtime");
+                if webview2_runtime_dir.is_dir() {
+                    std::env::set_var(
+                        "WEBVIEW2_BROWSER_EXECUTABLE_FOLDER",
+                        &webview2_runtime_dir,
+                    );
+                }
             }
         }
 
-        if !webview2::ensure_webview2() {
+        // 未内置 WebView2 运行时时，检测系统是否已安装，未安装则自动下载安装
+        if std::env::var_os("WEBVIEW2_BROWSER_EXECUTABLE_FOLDER").is_none()
+            && !webview2::ensure_webview2()
+        {
             std::process::exit(1);
         }