diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index 2b3adb4..f5804d8 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -356,6 +356,43 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
   // 标记是否已经为当前画布设置过标题（避免重复调用）
   const hasSetCanvasTitle = useRef(false);
 
+  // 获取最近的图片 URL（用于自动附加）
+  const getRecentImageUrl = useCallback((): string | null => {
+    // 1. 优先使用画布中选中的图片
+    if (selectedImageNodes.length > 0) {
+      return (selectedImageNodes[0].data as any)?.src || null;
+    }
+    
+    // 2. 其次使用画布中最近添加的图片
+    const imageNodes = nodes.filter(n => n.type === 'image' && (n.data as any)?.src);
+    if (imageNodes.length > 0) {
+      // 返回最后一个添加的图片（假设数组末尾是最新的）
+      return (imageNodes[imageNodes.length - 1].data as any)?.src || null;
+    }
+    
+    // 3. 最后从历史对话中查找图片
+    for (let i = messages.length - 1; i >= 0; i--) {
+      const msg = messages[i];
+      // 检查用户消息的附件
+      if (msg.role === 'user' && (msg as any).attachments?.length > 0) {
+        const attachment = (msg as any).attachments[0];
+        if (attachment.url && attachment.contentType?.startsWith('image/')) {
+          return attachment.url;
+        }
+      }
+      // 检查用户消息的 parts
+      if (msg.role === 'user' && (msg as any).parts) {
+        for (const part of (msg as any).parts) {
+          if (part.type === 'file' && part.url && part.mediaType?.startsWith('image/')) {
+            return part.url;
+          }
+        }
+      }
+    }
+    
+    return null;
+  }, [selectedImageNodes, nodes, messages]);
+
   // 处理发送（图片已在上传时添加到画布，这里只发送消息）
   const handleSend = useCallback(async () => {
     if (!input.trim() && attachments.length === 0) return;
@@ -367,8 +404,23 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     // 构建 parts 数组：文件在前，文本在后（与 multimodal-input 一致）
     const parts: any[] = [];
     
+    // 🆕 如果没有附件，自动使用最近的图片
+    let effectiveAttachments = [...attachments];
+    if (effectiveAttachments.length === 0 && input.trim()) {
+      const recentImageUrl = getRecentImageUrl();
+      if (recentImageUrl) {
+        // 自动添加最近的图片作为附件
+        effectiveAttachments.push({
+          url: recentImageUrl,
+          name: '最近图片',
+          contentType: 'image/jpeg',
+        });
+        console.log('[CanvasChat] 自动使用最近图片:', recentImageUrl);
+      }
+    }
+    
     // 添加文件部分（作为 file 类型的 part）
-    attachments.forEach((a) => {
+    effectiveAttachments.forEach((a) => {
       parts.push({
         type: "file" as const,
         mediaType: a.contentType,
@@ -378,7 +430,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     });
     
     // 添加文本部分
-    const textContent = input.trim() || (attachments.length > 0 ? "请处理这张图片" : "");
+    const textContent = input.trim() || (effectiveAttachments.length > 0 ? "请处理这张图片" : "");
     if (textContent) {
       parts.push({ type: "text" as const, text: textContent });
     }
@@ -391,7 +443,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     
     setInput("");
     setAttachments([]);
-  }, [input, attachments, selectedModelId, sendMessage]);
+  }, [input, attachments, selectedModelId, sendMessage, getRecentImageUrl]);
 
   // 处理文件选择 - 上传后立即添加到画布
   const handleFileSelect = async (e: React.ChangeEvent<HTMLInputElement>) => {