diff --git a/build.ps1 b/build.ps1
index 96464b6..1308986 100644
--- a/build.ps1
+++ b/build.ps1
@@ -96,13 +96,16 @@ if ($buildAdmin) {
     }
 
     # 安装/检查 pkg
-    $pkgCmd = Get-Command pkg -ErrorAction SilentlyContinue
+    # 优先找 npm global bin 目录下的 pkg（不依赖 PATH 是否刷新）
+    $npmGlobalBin = Join-Path (npm root -g 2>$null) "..\pkg.cmd" | Resolve-Path -ErrorAction SilentlyContinue
+    $pkgCmd = if ($npmGlobalBin) { $npmGlobalBin.Path } else { (Get-Command pkg -ErrorAction SilentlyContinue)?.Source }
     if (-not $pkgCmd) {
         Write-Warn "pkg 未安装，正在安装..."
         npm install -g pkg
-        # 刷新 PATH
         $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" +
                     [System.Environment]::GetEnvironmentVariable("Path","User")
+        $npmGlobalBin = Join-Path (npm root -g 2>$null) "..\pkg.cmd" | Resolve-Path -ErrorAction SilentlyContinue
+        $pkgCmd = $npmGlobalBin.Path
     }
 
     $inputJs   = Join-Path $ScriptDir "gen-authcode.js"
@@ -117,7 +120,7 @@ if ($buildAdmin) {
     Write-Host "  输出: $outputExe" -ForegroundColor Gray
     Write-Host "  (内嵌 Node.js 运行时，首次打包约 1 分钟)" -ForegroundColor Gray
 
-    pkg $inputJs --targets node18-win-x64 --output $outputExe 2>&1 |
+    & $pkgCmd $inputJs --targets node18-win-x64 --output $outputExe 2>&1 |
         ForEach-Object { Write-Host "    $_" -ForegroundColor Gray }
 
     if (Test-Path $outputExe) {