diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index cdf511a..c9518fe 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -1425,98 +1425,107 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
         </div>
       </div>
       
-      {/* 🆕 标签悬停预览弹窗 */}
-      {tagPreview && (
-        <div
-          data-tag-preview="true"
-          className="fixed z-[9999] bg-white dark:bg-zinc-900 rounded-xl shadow-2xl border border-border/50 overflow-hidden animate-in fade-in zoom-in-95 duration-150"
-          style={{
-            left: tagPreview.x,
-            top: tagPreview.y - 8,
-            transform: 'translate(-50%, -100%)',
-            maxWidth: '280px',
-          }}
-          onMouseEnter={() => {
-            // 鼠标进入预览弹窗，取消隐藏
-            if (previewTimeoutRef.current) {
-              clearTimeout(previewTimeoutRef.current);
-              previewTimeoutRef.current = null;
-            }
-          }}
-          onMouseLeave={() => {
-            // 鼠标离开预览弹窗，隐藏
-            setTagPreview(null);
-          }}
-        >
-          {/* 图片全貌 */}
-          <div className="relative">
-            <img
-              src={tagPreview.url}
-              alt={tagPreview.name}
-              className="w-full h-auto max-h-[200px] object-contain bg-zinc-100 dark:bg-zinc-800"
-            />
-            {/* 如果是物品标签，显示标注位置 */}
-            {tagPreview.pickedObject && (
-              <>
-                {/* 标注点 */}
-                <div
-                  className="absolute pointer-events-none"
-                  style={{
-                    left: `${tagPreview.pickedObject.clickX * 100}%`,
-                    top: `${tagPreview.pickedObject.clickY * 100}%`,
-                    transform: 'translate(-50%, -50%)',
-                  }}
-                >
-                  {/* 序号标记 */}
-                  <div className="relative flex items-center justify-center">
-                    {/* 脉冲动画背景 */}
-                    <div className="absolute w-8 h-8 rounded-full bg-blue-500/30 animate-ping" />
-                    {/* 主标记点 */}
-                    <div className="relative w-6 h-6 rounded-full bg-blue-500 border-2 border-white shadow-lg flex items-center justify-center">
-                      <svg className="w-3 h-3 text-white" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="3">
-                        <path d="M12 2v20M2 12h20" />
-                      </svg>
+      {/* 🆕 标签悬停预览弹窗 - 固定显示在标签上方 */}
+      {tagPreview && (() => {
+        // 计算弹窗位置，确保不超出视口
+        const previewWidth = 240;
+        const previewHeight = 280; // 预估高度
+        const padding = 16;
+        
+        // 水平位置：居中对齐标签，但确保不超出左右边界
+        let left = tagPreview.x - previewWidth / 2;
+        if (left < padding) left = padding;
+        if (left + previewWidth > window.innerWidth - padding) {
+          left = window.innerWidth - previewWidth - padding;
+        }
+        
+        // 垂直位置：显示在标签上方
+        let top = tagPreview.y - previewHeight - 12;
+        if (top < padding) {
+          // 如果上方空间不够，显示在标签下方
+          top = tagPreview.y + 30;
+        }
+        
+        return (
+          <div
+            data-tag-preview="true"
+            className="fixed z-[9999] bg-white dark:bg-zinc-900 rounded-xl shadow-2xl border border-border/50 overflow-hidden animate-in fade-in zoom-in-95 duration-150"
+            style={{
+              left: left,
+              top: top,
+              width: previewWidth,
+            }}
+            onMouseEnter={() => {
+              // 鼠标进入预览弹窗，取消隐藏
+              if (previewTimeoutRef.current) {
+                clearTimeout(previewTimeoutRef.current);
+                previewTimeoutRef.current = null;
+              }
+            }}
+            onMouseLeave={() => {
+              // 鼠标离开预览弹窗，隐藏
+              setTagPreview(null);
+            }}
+          >
+            {/* 图片全貌 */}
+            <div className="relative">
+              <img
+                src={tagPreview.url}
+                alt={tagPreview.name}
+                className="w-full h-auto max-h-[180px] object-contain bg-zinc-100 dark:bg-zinc-800"
+              />
+              {/* 如果是物品标签，显示标注位置 */}
+              {tagPreview.pickedObject && (
+                <>
+                  {/* 标注点 */}
+                  <div
+                    className="absolute pointer-events-none"
+                    style={{
+                      left: `${tagPreview.pickedObject.clickX * 100}%`,
+                      top: `${tagPreview.pickedObject.clickY * 100}%`,
+                      transform: 'translate(-50%, -50%)',
+                    }}
+                  >
+                    {/* 序号标记 */}
+                    <div className="relative flex items-center justify-center">
+                      {/* 脉冲动画背景 */}
+                      <div className="absolute w-6 h-6 rounded-full bg-blue-500/30 animate-ping" />
+                      {/* 主标记点 */}
+                      <div className="relative w-5 h-5 rounded-full bg-blue-500 border-2 border-white shadow-lg flex items-center justify-center">
+                        <svg className="w-2.5 h-2.5 text-white" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="3">
+                          <path d="M12 2v20M2 12h20" />
+                        </svg>
+                      </div>
                     </div>
                   </div>
-                </div>
-                {/* 物品名称标签 */}
-                <div 
-                  className="absolute bg-blue-500 text-white text-xs px-2 py-0.5 rounded shadow-lg whitespace-nowrap"
-                  style={{
-                    left: `${tagPreview.pickedObject.clickX * 100}%`,
-                    top: `${tagPreview.pickedObject.clickY * 100}%`,
-                    transform: 'translate(-50%, -150%)',
-                  }}
-                >
-                  {tagPreview.pickedObject.objectName}
-                </div>
-              </>
-            )}
-          </div>
-          {/* 底部信息 */}
-          <div className="px-3 py-2 bg-zinc-50 dark:bg-zinc-800/50 border-t border-border/30">
-            <div className="text-xs font-medium text-foreground/80 truncate">
-              {tagPreview.pickedObject ? tagPreview.pickedObject.objectName : tagPreview.name}
+                  {/* 物品名称标签 */}
+                  <div 
+                    className="absolute bg-blue-500 text-white text-xs px-1.5 py-0.5 rounded shadow-lg whitespace-nowrap"
+                    style={{
+                      left: `${tagPreview.pickedObject.clickX * 100}%`,
+                      top: `${tagPreview.pickedObject.clickY * 100}%`,
+                      transform: 'translate(-50%, -140%)',
+                    }}
+                  >
+                    {tagPreview.pickedObject.objectName}
+                  </div>
+                </>
+              )}
             </div>
-            {tagPreview.pickedObject && (
-              <div className="text-xs text-muted-foreground">
-                {tagPreview.pickedObject.objectPosition}
+            {/* 底部信息 */}
+            <div className="px-3 py-2 bg-zinc-50 dark:bg-zinc-800/50 border-t border-border/30">
+              <div className="text-xs font-medium text-foreground/80 truncate">
+                {tagPreview.pickedObject ? tagPreview.pickedObject.objectName : tagPreview.name}
               </div>
-            )}
+              {tagPreview.pickedObject && (
+                <div className="text-xs text-muted-foreground">
+                  {tagPreview.pickedObject.objectPosition}
+                </div>
+              )}
+            </div>
           </div>
-          {/* 小三角箭头 */}
-          <div 
-            className="absolute left-1/2 bottom-0 -translate-x-1/2 translate-y-full"
-            style={{
-              width: 0,
-              height: 0,
-              borderLeft: '8px solid transparent',
-              borderRight: '8px solid transparent',
-              borderTop: '8px solid rgb(250 250 250)',
-            }}
-          />
-        </div>
-      )}
+        );
+      })()}
     </div>
   );
 }