diff --git a/src/hooks/useExport.ts b/src/hooks/useExport.ts
index a5f52dc2..212da26d 100644
--- a/src/hooks/useExport.ts
+++ b/src/hooks/useExport.ts
@@ -380,6 +380,10 @@ export default () => {
 
     if (viewportRatio.value === 0.625) pptx.layout = 'LAYOUT_16x10'
     else if (viewportRatio.value === 0.75) pptx.layout = 'LAYOUT_4x3'
+    else if (viewportRatio.value === 0.70710678) {
+      pptx.defineLayout({ name: 'A3', width: 10, height: 7.0710678 })
+      pptx.layout = 'A3'
+    }
     else pptx.layout = 'LAYOUT_16x9'
 
     if (masterOverwrite) {
diff --git a/src/views/Editor/Toolbar/SlideDesignPanel.vue b/src/views/Editor/Toolbar/SlideDesignPanel.vue
index f52f7cef..1dd2a9c3 100644
--- a/src/views/Editor/Toolbar/SlideDesignPanel.vue
+++ b/src/views/Editor/Toolbar/SlideDesignPanel.vue
@@ -103,6 +103,7 @@
         <SelectOption :value="0.5625">宽屏 16 : 9</SelectOption>
         <SelectOption :value="0.625">宽屏 16 ：10</SelectOption>
         <SelectOption :value="0.75">标准 4 ：3</SelectOption>
+        <SelectOption :value="0.70710678">A3 / A4</SelectOption>
       </Select>
     </div>