diff --git a/lib/print/pavo/pavo_ffi.dart b/lib/print/pavo/pavo_ffi.dart
index 3b8ec77..6136eec 100644
--- a/lib/print/pavo/pavo_ffi.dart
+++ b/lib/print/pavo/pavo_ffi.dart
@@ -21,7 +21,7 @@ class PavoApi {
     _printOneCard = _tryPrintOneCard('PAVO_PrintOneCardW') ?? _tryPrintOneCard('PAVO_PrintOneCard')!;
     // 布局自检：Dart Struct 按 C ABI 自然对齐，与 C# 版（已实机验证）的
     // sizeof 逐一核对；首个 Windows 环境首跑即暴露对齐差异
-    assert(sizeOf<HitiCardPrintParameter>() == 80, 'HitiCardPrintParameter 布局异常');
+    assert(sizeOf<HitiCardPrintParameter>() == 88, 'HitiCardPrintParameter 布局异常');
     assert(sizeOf<GdiBitmap>() == 32, 'GdiBitmap 布局异常');
     assert(sizeOf<HitiHeatingEnergy>() == 16, 'HitiHeatingEnergy 布局异常');
     assert(sizeOf<HitiSettings>() == 48, 'HitiSettings 布局异常');
diff --git a/test/pavo_ffi_layout_test.dart b/test/pavo_ffi_layout_test.dart
new file mode 100644
index 0000000..f79825c
--- /dev/null
+++ b/test/pavo_ffi_layout_test.dart
@@ -0,0 +1,16 @@
+import 'dart:ffi';
+
+import 'package:desktop_plugin/print/pavo/pavo_ffi.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+/// Pavo ffi 结构体布局守护：与 C# 实机验证版的 sizeof 逐一核对。
+/// 布局错误在 mac 上跑本测试即红，不必等 Windows 实机。
+/// （HitiCardPrintParameter = 4×uint32 + 8×uint8 + 8×pointer = 24+64 = 88）
+void main() {
+  test('Pavo ffi 结构体布局与 C ABI 一致', () {
+    expect(sizeOf<HitiCardPrintParameter>(), 88);
+    expect(sizeOf<GdiBitmap>(), 32);
+    expect(sizeOf<HitiHeatingEnergy>(), 16);
+    expect(sizeOf<HitiSettings>(), 48);
+  });
+}