diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index 1ea191e..5290b2a 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -58,15 +58,22 @@ interface CanvasChatPanelProps {
 // 建议卡片数据 - 已移除
 const SUGGESTIONS: { title: string; desc: string; image: string }[] = [];
 
-// 获取图片的原始尺寸
-function getImageDimensions(url: string): Promise<{ width: number; height: number }> {
+// 获取图片尺寸（保留原图分辨率 + 画布显示尺寸）
+function getImageDimensions(url: string): Promise<{
+  width: number;
+  height: number;
+  originalWidth: number;
+  originalHeight: number;
+}> {
   return new Promise((resolve) => {
     const img = new Image();
     img.onload = () => {
       // 限制最大尺寸，避免节点过大
       const maxSize = 500;
-      let width = img.naturalWidth;
-      let height = img.naturalHeight;
+      const originalWidth = img.naturalWidth;
+      const originalHeight = img.naturalHeight;
+      let width = originalWidth;
+      let height = originalHeight;
       
       // 如果图片太大，按比例缩小
       if (width > maxSize || height > maxSize) {
@@ -83,11 +90,11 @@ function getImageDimensions(url: string): Promise<{ width: number; height: numbe
         height = Math.round(height * scale);
       }
       
-      resolve({ width, height });
+      resolve({ width, height, originalWidth, originalHeight });
     };
     img.onerror = () => {
       // 加载失败时使用默认尺寸
-      resolve({ width: 300, height: 300 });
+      resolve({ width: 300, height: 300, originalWidth: 0, originalHeight: 0 });
     };
     img.src = url;
   });
@@ -682,6 +689,10 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
                 src: url,
                 status: 'completed',
                 prompt: '对话生成',
+                metadata: {
+                  originalWidth: dimensions.originalWidth,
+                  originalHeight: dimensions.originalHeight,
+                },
               },
               connections: [],
             });
@@ -812,9 +823,15 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
         : `用户未选中图片，默认使用最近 ${contextNodes.length} 张`,
       ...contextNodes.map((node, index) => {
         const label = positionLabel(node);
-        const size = node.size ? `${Math.round(node.size.width)}x${Math.round(node.size.height)}` : "未知尺寸";
+        const metadata = (node.data as any)?.metadata;
+        const originalWidth = Number(metadata?.originalWidth || 0);
+        const originalHeight = Number(metadata?.originalHeight || 0);
+        const originalSize =
+          originalWidth > 0 && originalHeight > 0
+            ? `，原图分辨率 ${Math.round(originalWidth)}x${Math.round(originalHeight)}`
+            : "";
         const prompt = (node.data as any)?.prompt;
-        return `图片${index + 1}: ${label}，尺寸 ${size}${prompt ? `，描述：${String(prompt).slice(0, 60)}` : ""}`;
+        return `图片${index + 1}: ${label}${originalSize}${prompt ? `，描述：${String(prompt).slice(0, 60)}` : ""}`;
       }),
       "若用户提到左/右/上/下/中等方位，请匹配对应位置的图片。",
     ];
@@ -1001,6 +1018,10 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
             status: 'completed',
             title: file.name.replace(/\.[^.]+$/, ""),
             prompt: file.name.replace(/\.[^.]+$/, ""),
+            metadata: {
+              originalWidth: dimensions.originalWidth,
+              originalHeight: dimensions.originalHeight,
+            },
           },
           connections: [],
         });
diff --git a/components/canvas/CanvasWorkspace.tsx b/components/canvas/CanvasWorkspace.tsx
index dfa31a8..8847378 100644
--- a/components/canvas/CanvasWorkspace.tsx
+++ b/components/canvas/CanvasWorkspace.tsx
@@ -295,14 +295,21 @@ export function CanvasWorkspace() {
     setViewport({ x: newX, y: newY, zoom: newZoom });
   }, [isMacPlatform, setViewport, viewport.x, viewport.y, viewport.zoom]);
 
-  const getImageDimensionsFromFile = useCallback((file: File): Promise<{ width: number; height: number }> => {
+  const getImageDimensionsFromFile = useCallback((file: File): Promise<{
+    width: number;
+    height: number;
+    originalWidth: number;
+    originalHeight: number;
+  }> => {
     return new Promise((resolve) => {
       const url = URL.createObjectURL(file);
       const img = new Image();
       img.onload = () => {
         const maxSize = 500;
-        let width = img.naturalWidth;
-        let height = img.naturalHeight;
+        const originalWidth = img.naturalWidth;
+        const originalHeight = img.naturalHeight;
+        let width = originalWidth;
+        let height = originalHeight;
         if (width > maxSize || height > maxSize) {
           const scale = Math.min(maxSize / width, maxSize / height);
           width = Math.round(width * scale);
@@ -315,11 +322,11 @@ export function CanvasWorkspace() {
           height = Math.round(height * scale);
         }
         URL.revokeObjectURL(url);
-        resolve({ width, height });
+        resolve({ width, height, originalWidth, originalHeight });
       };
       img.onerror = () => {
         URL.revokeObjectURL(url);
-        resolve({ width: 300, height: 300 });
+        resolve({ width: 300, height: 300, originalWidth: 0, originalHeight: 0 });
       };
       img.src = url;
     });
@@ -352,6 +359,10 @@ export function CanvasWorkspace() {
           status: "generating",
           prompt: cleanName || "拖拽上传",
           title: cleanName || "拖拽上传",
+          metadata: {
+            originalWidth: dimensions.originalWidth,
+            originalHeight: dimensions.originalHeight,
+          },
         },
         connections: [],
       });
@@ -365,6 +376,10 @@ export function CanvasWorkspace() {
               status: "completed",
               prompt: cleanName || "拖拽上传",
               title: cleanName || "拖拽上传",
+              metadata: {
+                originalWidth: dimensions.originalWidth,
+                originalHeight: dimensions.originalHeight,
+              },
             },
           });
           toast.success("图片已添加到画布");
diff --git a/lib/ai/auto-agent-graph.ts b/lib/ai/auto-agent-graph.ts
index 595fb74..002184e 100644
--- a/lib/ai/auto-agent-graph.ts
+++ b/lib/ai/auto-agent-graph.ts
@@ -139,7 +139,8 @@ async function generateAgentConversation(
    - ### 图片分析
    - ### 执行计划
    - ### 输出设置
-6) “图片分析”要结合每张参考图差异，给出风格/构图/材质/光影等具体观察。`;
+6) “图片分析”要结合每张参考图差异，给出风格/构图/材质/光影等具体观察。
+7) 只有明确拿到“原图分辨率”时，才能写具体像素尺寸；否则只写宽高比/清晰度目标，不要编造 335x500 这类预览尺寸。`;
 
     const prompt = [
       `【用户原始需求】${state.text || "（无文本）"}`,