diff --git a/src/main/desktop-pick.ts b/src/main/desktop-pick.ts
index e3fb8a6..769bfb6 100644
--- a/src/main/desktop-pick.ts
+++ b/src/main/desktop-pick.ts
@@ -717,16 +717,19 @@ function regionOverlayHtml(): string {
 export async function pickScreenRegion(): Promise<{ x: number; y: number; width: number; height: number; scale: number; imagePath: string }> {
   const appWindows = BrowserWindow.getAllWindows().filter(w => !w.isDestroyed());
   for (const w of appWindows) w.minimize();
-  // 每个显示器各开一个覆盖层, 支持在任意副屏上框选
+  // 每个显示器各开一个覆盖层, 支持在任意副屏上框选。
+  // 注意: 构造参数里直接传副屏 bounds 在混合 DPI 下会按主屏 DPI 虚拟化导致尺寸不对,
+  // 必须先创建(隐藏)再 setBounds, 此时窗口已关联副屏 DPI
   const displays = screen.getAllDisplays();
   const url = "data:text/html;charset=utf-8," + encodeURIComponent(regionOverlayHtml());
   const overlays = displays.map(display => {
     const win = new BrowserWindow({
-      x: display.bounds.x, y: display.bounds.y, width: display.bounds.width, height: display.bounds.height,
+      show: false,
       frame: false, transparent: true, alwaysOnTop: true, skipTaskbar: true, resizable: false, movable: false,
       webPreferences: { contextIsolation: true, nodeIntegration: false, sandbox: true }
     });
     void win.loadURL(url);
+    win.setBounds({ x: display.bounds.x, y: display.bounds.y, width: display.bounds.width, height: display.bounds.height });
     win.show();
     return { win, display };
   });