diff --git a/lib/ai/providers/alibaba-image.ts b/lib/ai/providers/alibaba-image.ts
index 24ecf2d..eb4fc3b 100644
--- a/lib/ai/providers/alibaba-image.ts
+++ b/lib/ai/providers/alibaba-image.ts
@@ -368,19 +368,69 @@ export function createAlibabaImage({ apiKey, baseURL }: AlibabaImageConfig) {
             seed: options.imageParams?.seed,
           };
           
-          // 处理分辨率
+          // 处理分辨率：结合 aspectRatio（宽高比）和 imageSize（分辨率等级）
+          const aspectRatio = options.imageParams?.aspectRatio || "auto";
+          const imageSize = options.imageParams?.imageSize || "2K";
+          
+          // 根据分辨率等级确定基准像素
+          const baseSizeMap: Record<string, number> = {
+            "1K": 1024,
+            "2K": 1536,
+            "4K": 2048,
+          };
+          const baseSize = baseSizeMap[imageSize] || 1536;
+          
+          // 根据宽高比计算实际分辨率
+          // 阿里云 API 要求宽高在 512-2048 之间
+          const calculateSize = (ratio: string, base: number): string => {
+            // 解析宽高比
+            const ratioMap: Record<string, [number, number]> = {
+              "auto": [1, 1],
+              "1:1": [1, 1],
+              "16:9": [16, 9],
+              "9:16": [9, 16],
+              "4:3": [4, 3],
+              "3:4": [3, 4],
+              "3:2": [3, 2],
+              "2:3": [2, 3],
+              "5:4": [5, 4],
+              "4:5": [4, 5],
+              "21:9": [21, 9],
+            };
+            
+            const [w, h] = ratioMap[ratio] || [1, 1];
+            
+            // 计算宽高，保持总像素接近 base*base
+            const totalPixels = base * base;
+            const aspectValue = w / h;
+            
+            // height = sqrt(totalPixels / aspectValue)
+            // width = height * aspectValue
+            let height = Math.round(Math.sqrt(totalPixels / aspectValue));
+            let width = Math.round(height * aspectValue);
+            
+            // 确保宽高在 512-2048 范围内
+            const clamp = (val: number) => Math.max(512, Math.min(2048, val));
+            width = clamp(width);
+            height = clamp(height);
+            
+            // 确保是偶数（某些图像处理可能需要）
+            width = Math.round(width / 2) * 2;
+            height = Math.round(height / 2) * 2;
+            
+            return `${width}*${height}`;
+          };
+          
+          // 如果用户直接指定了 size，使用用户指定的
           if (options.imageParams?.size) {
             params.size = options.imageParams.size;
-          } else if (options.imageParams?.imageSize) {
-            // 从 imageSize (如 "2K") 转换为具体分辨率
-            const sizeMap: Record<string, string> = {
-              "1K": "1024*1024",
-              "2K": "1536*1536",
-              "4K": "2048*2048",
-            };
-            params.size = sizeMap[options.imageParams.imageSize] || "1024*1024";
+          } else {
+            // 否则根据 aspectRatio 和 imageSize 计算
+            params.size = calculateSize(aspectRatio, baseSize);
           }
           
+          console.log(`[Alibaba Image] Calculated size: aspectRatio=${aspectRatio}, imageSize=${imageSize} => size=${params.size}`);
+          
           // 根据图片数量确定编辑模式
           const editMode = imageUrls.length === 1 ? "单图编辑" : `多图融合 (${imageUrls.length}张)`;
           console.log("[Alibaba Image] 编辑模式:", editMode);