diff --git a/build.bat b/build.bat
index 08ffc6e..375a495 100644
--- a/build.bat
+++ b/build.bat
@@ -2,11 +2,13 @@
 REM ============================================================
 REM  geopro build helper  (Windows / MSVC + Ninja, CMake presets)
 REM
-REM  Usage:  build [app | all | test | run | configure]
-REM    app        (default) build target geopro_desktop
-REM    all        build all targets
+REM  Usage:  build [app | all | test | run | rebuild | configure]
+REM    app        (default) build target geopro_desktop (incremental)
+REM    all        build all targets (incremental)
 REM    test       build + run unit tests via ctest
-REM    run        build + launch geopro_desktop
+REM    run        incremental build + launch geopro_desktop
+REM    rebuild    FORCE clean rebuild (--clean-first) + launch — use when
+REM               incremental seems stale / changes not showing up
 REM    configure  force re-run CMake configure (after CMakeLists changes)
 REM
 REM  Requires: Visual Studio 2022/2026 (Desktop C++ workload, ships
@@ -48,7 +50,8 @@ if /i "%CMD%"=="app"       goto :app
 if /i "%CMD%"=="all"       goto :all
 if /i "%CMD%"=="test"      goto :test
 if /i "%CMD%"=="run"       goto :run
-echo [build] unknown command "%CMD%". Use: app ^| all ^| test ^| run ^| configure
+if /i "%CMD%"=="rebuild"   goto :rebuild
+echo [build] unknown command "%CMD%". Use: app ^| all ^| test ^| run ^| rebuild ^| configure
 exit /b 1
 
 :ensure
@@ -80,3 +83,11 @@ call :ensure
 "%CMAKE%" --build "%BUILDDIR%" --target geopro_desktop || exit /b 1
 "%BUILDDIR%\src\app\geopro_desktop.exe"
 exit /b %errorlevel%
+
+:rebuild
+REM 强制全量重编（--clean-first 先清后编），规避 ninja 增量偶发漏编；编后启动。
+REM 注意：若 geopro_desktop 正在运行，链接会因 exe 被占用失败(LNK1104)——先关掉 app。
+call :ensure
+"%CMAKE%" --build "%BUILDDIR%" --target geopro_desktop --clean-first || exit /b 1
+"%BUILDDIR%\src\app\geopro_desktop.exe"
+exit /b %errorlevel%