diff --git a/apps/web/src/api/generation/types.ts b/apps/web/src/api/generation/types.ts
index 745222caf..6b877681e 100755
--- a/apps/web/src/api/generation/types.ts
+++ b/apps/web/src/api/generation/types.ts
@@ -13,6 +13,10 @@ export interface CreatePreviewRequest {
   video_title?: string
   duration?: number
   video_ratio?: string
+  /** 输出视频宽度（与 video_ratio 匹配，如 9:16 → 1080） */
+  output_width?: number
+  /** 输出视频高度（与 video_ratio 匹配，如 9:16 → 1920） */
+  output_height?: number
   /* 标题烧录配置（可选，传入后 ASS 渲染标题到预览视频中） */
   title_config?: {
     text?: string
diff --git a/apps/web/src/pages/generate/GeneratePage.tsx b/apps/web/src/pages/generate/GeneratePage.tsx
index ec232cfc1..8e644c8d0 100644
--- a/apps/web/src/pages/generate/GeneratePage.tsx
+++ b/apps/web/src/pages/generate/GeneratePage.tsx
@@ -15,6 +15,7 @@ import { Modal, message } from "antd"
 import { useNavigate } from "react-router-dom"
 import type { VoiceClone } from "@/api/voice-clone"
 import { useCloneProgress } from "@/hooks/useCloneProgress"
+import { calculateResolution } from "./utils/calculateResolution"
 import CloneModal from "@/components/voice/CloneModal"
 import GenerateHeader from "./components/GenerateHeader"
 import {
@@ -119,6 +120,9 @@ const GeneratePage: React.FC = () => {
     [bgm, currentTemplate],
   )
 
+  /* ── 输出分辨率（根据视频比例计算） ── */
+  const resolution = useMemo(() => calculateResolution(videoRatio), [videoRatio])
+
   /* ── 加载素材详情（仅用于配音时长校验，不用于播放） ── */
   const previewAssetsEnabled = previewAssetIds.length > 0
   const { assets: previewAssets } = usePreviewAssets(previewAssetIds, previewAssetsEnabled)
@@ -143,6 +147,8 @@ const GeneratePage: React.FC = () => {
       asset_ids: previewAssetIds,
       duration: duration || 30,
       video_ratio: videoRatio,
+      output_width: resolution.width,
+      output_height: resolution.height,
       ...(voiceLibraryId ? { voice_library_id: voiceLibraryId } : {}),
       bgm_config: {
         enabled: bgm !== false,
@@ -168,6 +174,7 @@ const GeneratePage: React.FC = () => {
     previewAssetIds,
     duration,
     videoRatio,
+    resolution,
     voiceLibraryId,
     bgm,
     bgmConfig,
diff --git a/apps/web/src/pages/generate/hooks/useGenerateVideo.ts b/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
index d9eb41b0a..34e9afebf 100755
--- a/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
+++ b/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
@@ -11,6 +11,7 @@ import type { UseGenerateVideoProps } from "./generate-video/types"
 import { getGenerationPhase } from "./generate-video/phase"
 import { useGenerationPolling } from "./generate-video/useGenerationPolling"
 import { validateGenerateInputs } from "./generate-video/buildPayload"
+import { calculateResolution } from "../utils/calculateResolution"
 import { extractBackendError, translateError } from "./generate-video/errorUtils"
 
 export function useGenerateVideo(props: UseGenerateVideoProps) {
@@ -60,37 +61,10 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
     clearTimer()
 
     try {
-      // 解析分辨率
-      const ratio = props.videoRatio || "9:16"
-      let outputWidth: number
-      let outputHeight: number
-
-      if (ratio.includes(":")) {
-        const [rw, rh] = ratio.split(":").map(Number)
-        if (rw > 0 && rh > 0) {
-          const [longSide, shortSide] = rw < rh ? [rh, rw] : [rw, rh]
-          const baseLong = 1920
-          const baseShort = Math.round((baseLong * shortSide) / longSide)
-          const evenShort = baseShort - (baseShort % 2)
-          if (rw < rh) {
-            outputWidth = evenShort
-            outputHeight = baseLong
-          } else {
-            outputWidth = baseLong
-            outputHeight = evenShort
-          }
-        } else {
-          outputWidth = 1080
-          outputHeight = 1920
-        }
-      } else if (ratio.includes("x")) {
-        const [wStr, hStr] = ratio.split("x")
-        outputWidth = parseInt(wStr, 10) || 1080
-        outputHeight = parseInt(hStr, 10) || 1920
-      } else {
-        outputWidth = 1080
-        outputHeight = 1920
-      }
+      // 解析分辨率（共享工具函数，与预览 API 一致）
+      const { width: outputWidth, height: outputHeight } = calculateResolution(
+        props.videoRatio || "9:16",
+      )
 
       const assetIds =
         props.materialMode === "auto" ? props.smartSelectedIds : props.selectedMaterials
diff --git a/apps/web/src/pages/generate/utils/calculateResolution.ts b/apps/web/src/pages/generate/utils/calculateResolution.ts
new file mode 100644
index 000000000..e26b241df
--- /dev/null
+++ b/apps/web/src/pages/generate/utils/calculateResolution.ts
@@ -0,0 +1,46 @@
+/**
+ * 根据视频比例计算输出分辨率
+ *
+ * 规则：
+ * - 长边固定 1920
+ * - 短边按 1920 × (短/长) 计算，对齐到偶数
+ * - 9:16 → 1080×1920（竖屏）
+ * - 16:9 → 1920×1080（横屏）
+ * - 1:1   → 1920×1920
+ * - 无法解析时 fallback 到 1080×1920
+ */
+export interface Resolution {
+  width: number
+  height: number
+}
+
+export function calculateResolution(ratio: string): Resolution {
+  if (!ratio) return { width: 1080, height: 1920 }
+
+  if (ratio.includes(":")) {
+    const [rw, rh] = ratio.split(":").map(Number)
+    if (rw > 0 && rh > 0) {
+      const [longSide, shortSide] = rw < rh ? [rh, rw] : [rw, rh]
+      const baseLong = 1920
+      const baseShort = Math.round((baseLong * shortSide) / longSide)
+      const evenShort = baseShort - (baseShort % 2)
+      if (rw < rh) {
+        // 竖屏：短边是宽，长边是高
+        return { width: evenShort, height: baseLong }
+      } else {
+        // 横屏：长边是宽，短边是高
+        return { width: baseLong, height: evenShort }
+      }
+    }
+    return { width: 1080, height: 1920 }
+  }
+
+  if (ratio.includes("x")) {
+    const [wStr, hStr] = ratio.split("x")
+    const w = parseInt(wStr, 10) || 1080
+    const h = parseInt(hStr, 10) || 1920
+    return { width: w, height: h }
+  }
+
+  return { width: 1080, height: 1920 }
+}