diff --git a/frontend/src/components/GraphView/index.tsx b/frontend/src/components/GraphView/index.tsx
index f30b3c2..5332411 100644
--- a/frontend/src/components/GraphView/index.tsx
+++ b/frontend/src/components/GraphView/index.tsx
@@ -8,9 +8,8 @@ import { GRAPH_DEFAULT_HEIGHT } from '../../config/constants';
 interface GraphViewProps {
   data: GraphData;
   layout?: GraphLayoutConfig;
-  onNodeClick?: (node: Node) => void;
+  onNodeClick?: (node: Node | null) => void;
   onEdgeClick?: (edge: Edge) => void;
-  onNodeHover?: (node: Node | null) => void;
   height?: number;
 }
 
@@ -23,14 +22,25 @@ export const GraphView = ({
   layout = FORCE_LAYOUT_CONFIG,
   onNodeClick,
   onEdgeClick,
-  onNodeHover,
   height = GRAPH_DEFAULT_HEIGHT,
 }: GraphViewProps) => {
   const containerRef = useRef<HTMLDivElement>(null);
   const graphRef = useRef<Graph | null>(null);
+  const cleanupRef = useRef<(() => void) | null>(null);
+  const isCancelledRef = useRef(false);
+  const renderPromiseRef = useRef<Promise<void> | null>(null);
+
+  const onNodeClickRef = useRef(onNodeClick);
+  const onEdgeClickRef = useRef(onEdgeClick);
+
+  useEffect(() => {
+    onNodeClickRef.current = onNodeClick;
+    onEdgeClickRef.current = onEdgeClick;
+  }, [onNodeClick, onEdgeClick]);
 
   useEffect(() => {
     if (!containerRef.current) return;
+    if (!data.id || data.nodes.length === 0) return;
 
     // 清理现有图谱实例
     if (graphRef.current) {
@@ -98,6 +108,15 @@ export const GraphView = ({
           size: 50,
           lineWidth: 2,
         },
+        state: {
+          selected: {
+            stroke: '#1890FF',
+            lineWidth: 4,
+            halo: true,
+            haloColor: 'rgba(24, 144, 255, 0.3)',
+            haloLineWidth: 12,
+          },
+        },
       },
       edge: {
         type: 'line',
@@ -105,65 +124,102 @@ export const GraphView = ({
           lineWidth: 1,
           endArrow: true,
         },
+        state: {
+          selected: {
+            stroke: '#1890FF',
+            lineWidth: 3,
+          },
+        },
       },
       layout: {
         ...FORCE_LAYOUT_CONFIG,
       },
-      behaviors: GRAPH_BEHAVIORS,
+      behaviors: [
+        ...GRAPH_BEHAVIORS,
+        {
+          type: 'click-select',
+          key: 'click-select',
+          degree: 0,
+          state: 'selected',
+          multiple: false,
+          animation: true,
+          onClick: (event: any) => {
+            console.log('[GraphView] Node click event triggered', event);
+            console.log('[GraphView] event.target:', event.target);
+            console.log('[GraphView] onNodeClickRef.current:', onNodeClickRef.current);
+            
+            if (event.target && event.target.id) {
+              const nodeId = event.target.id;
+              console.log('[GraphView] Looking for node with id:', nodeId);
+              console.log('[GraphView] Available nodes:', data.nodes.map((n: Node) => n.id));
+              
+              const node = data.nodes.find((n: Node) => n.id === nodeId);
+              console.log('[GraphView] Found node:', nodeId, node);
+              
+              if (node && onNodeClickRef.current) {
+                console.log('[GraphView] Calling onNodeClick callback with node:', node);
+                onNodeClickRef.current(node);
+              } else {
+                console.log('[GraphView] Failed: node not found or callback not available');
+              }
+            }
+          },
+        },
+        {
+          type: 'drag-element-force',
+          key: 'drag-element-force',
+          state: 'selected',
+          fixed: false,
+        },
+      ],
     };
 
     const graph = new Graph(graphConfig);
     graphRef.current = graph;
-    
-    graph.render().catch((renderError) => {
-      console.error('Graph render error:', renderError);
-    });
 
-    // 节点点击事件
-    graph.on('node:click', (evt: any) => {
-      const nodeId = evt.target.id;
-      if (nodeId && onNodeClick) {
-        const nodeData = data.nodes.find((n: Node) => n.id === nodeId);
-        if (nodeData) {
-          onNodeClick(nodeData);
-        }
+    isCancelledRef.current = false;
+    cleanupRef.current = () => {
+      isCancelledRef.current = true;
+    };
+
+    renderPromiseRef.current = graph.render().catch((renderError) => {
+      if (!isCancelledRef.current) {
+        console.error('Graph render error:', renderError);
       }
     });
 
-    // 边点击事件
-    graph.on('edge:click', (evt: any) => {
-      if (evt.target.id && onEdgeClick) {
-        const edgeData = data.edges.find((e: Edge) => e.id === evt.target.id);
-        if (edgeData) {
-          onEdgeClick(edgeData);
-        }
+
+
+
+
+    // 画布点击事件（取消选择）
+    graph.on('canvas:click', () => {
+      console.log('[GraphView] Canvas click - deselecting node');
+      console.log('[GraphView] onNodeClickRef.current:', onNodeClickRef.current);
+      if (onNodeClickRef.current) {
+        console.log('[GraphView] Calling onNodeClick with null');
+        onNodeClickRef.current(null);
       }
     });
 
-    // 节点悬停事件
-    graph.on('node:mouseenter', (evt: any) => {
-      if (evt.target.id && onNodeHover) {
-        const nodeData = data.nodes.find((n: Node) => n.id === evt.target.id);
-        if (nodeData) {
-          onNodeHover(nodeData);
-        }
-      }
-    });
 
-    graph.on('node:mouseleave', () => {
-      if (onNodeHover) {
-        onNodeHover(null);
-      }
-    });
 
     // 清理函数
     return () => {
+      isCancelledRef.current = true;
+
+      if (renderPromiseRef.current) {
+        renderPromiseRef.current.catch(() => {});
+        renderPromiseRef.current = null;
+      }
+
       if (graphRef.current) {
+        graphRef.current.off('canvas:click');
         graphRef.current.destroy();
         graphRef.current = null;
       }
     };
-  }, [height, layout.type, onNodeClick, onEdgeClick, onNodeHover, data]);
+  }, [height, layout.type, data.id, onNodeClickRef, onEdgeClickRef]);
 
   // 窗口大小调整响应
   useEffect(() => {
diff --git a/frontend/src/components/NodePanel/index.tsx b/frontend/src/components/NodePanel/index.tsx
index ddb972f..1e495ee 100644
--- a/frontend/src/components/NodePanel/index.tsx
+++ b/frontend/src/components/NodePanel/index.tsx
@@ -16,7 +16,7 @@ export const NodePanel = ({ node, onClose }: NodePanelProps) => {
   const hasProperties = node.properties && Object.keys(node.properties).length > 0;
 
   return (
-    <div className="w-80 bg-white border-l border-gray-200 shadow-lg overflow-y-auto">
+    <div className="w-full overflow-y-auto">
       <div className="p-4 border-b border-gray-200 flex justify-between items-center">
         <h3 className="text-lg font-semibold text-gray-800">节点详情</h3>
         {onClose && (
diff --git a/frontend/src/components/NodeTooltip/index.tsx b/frontend/src/components/NodeTooltip/index.tsx
new file mode 100644
index 0000000..4dc1655
--- /dev/null
+++ b/frontend/src/components/NodeTooltip/index.tsx
@@ -0,0 +1,102 @@
+import { useState, useEffect, useMemo } from 'react';
+import type { Node } from '../../types/graph';
+
+interface NodeTooltipProps {
+  node: Node | null;
+}
+
+export const NodeTooltip = ({ node }: NodeTooltipProps) => {
+  const [isExpanded, setIsExpanded] = useState(false);
+
+  useEffect(() => {
+    setIsExpanded(false);
+  }, [node?.id]);
+
+  const propertiesList = useMemo(() => {
+    if (!node?.properties) return [];
+    return Object.entries(node.properties);
+  }, [node?.properties]);
+
+  const hasProperties = propertiesList.length > 0;
+
+  if (!node) return null;
+
+  const handleExpand = () => setIsExpanded(true);
+  const handleCollapse = () => setIsExpanded(false);
+
+  return (
+    <div className="absolute bottom-4 right-1/2 translate-x-1/2 bg-white/95 backdrop-blur-sm rounded-lg shadow-lg p-4 max-w-md w-80 z-20">
+      {!isExpanded ? (
+        <div className="space-y-2">
+          <div className="flex justify-between items-start">
+            <div className="font-semibold text-base text-gray-800">{node.label}</div>
+          </div>
+          {node.type && (
+            <div className="text-xs text-gray-500 bg-gray-100 px-2 py-0.5 rounded inline-block">
+              {node.type}
+            </div>
+          )}
+          {hasProperties && (
+            <div className="space-y-1 text-xs">
+              {propertiesList.slice(0, 2).map(([key, value]) => (
+                <div key={key} className="flex justify-between gap-2">
+                  <span className="text-gray-500 shrink-0">{key}:</span>
+                  <span className="text-gray-800 text-right truncate max-w-[70%]">
+                    {typeof value === 'object' ? JSON.stringify(value) : String(value)}
+                  </span>
+                </div>
+              ))}
+              {propertiesList.length > 2 && (
+                <div className="text-gray-400 text-center pt-1">还有 {propertiesList.length - 2} 项属性...</div>
+              )}
+            </div>
+          )}
+          {hasProperties && (
+            <button 
+              onClick={handleExpand}
+              className="w-full mt-2 py-1.5 text-xs font-medium text-blue-600 hover:text-blue-700 hover:bg-blue-50 rounded transition-colors"
+            >
+              展开查看全部 ▼
+            </button>
+          )}
+        </div>
+      ) : (
+        <div className="space-y-3">
+          <div className="flex justify-between items-start">
+            <div className="font-semibold text-base text-gray-800">{node.label}</div>
+            <button 
+              onClick={handleCollapse}
+              className="text-xs text-gray-500 hover:text-gray-700 px-2 py-0.5 hover:bg-gray-100 rounded transition-colors"
+            >
+              收起 ▲
+            </button>
+          </div>
+          {node.type && (
+            <div className="text-xs text-gray-500 bg-gray-100 px-2 py-0.5 rounded inline-block">
+              {node.type}
+            </div>
+          )}
+          {hasProperties && (
+            <div>
+              <div className="text-xs text-gray-500 uppercase tracking-wide mb-2">
+                属性 ({propertiesList.length})
+              </div>
+              <div className="space-y-1.5 text-xs max-h-40 overflow-y-auto">
+                {propertiesList.map(([key, value]) => (
+                  <div key={key} className="flex justify-between gap-2 py-0.5">
+                    <span className="text-gray-600 shrink-0">{key}:</span>
+                    <span className="text-gray-800 text-right break-all max-w-[65%]">
+                      {typeof value === 'object' ? JSON.stringify(value) : String(value)}
+                    </span>
+                  </div>
+                ))}
+              </div>
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+};
+
+export default NodeTooltip;
\ No newline at end of file
diff --git a/frontend/src/hooks/useGraphData.ts b/frontend/src/hooks/useGraphData.ts
index b626d92..b7bfc0f 100644
--- a/frontend/src/hooks/useGraphData.ts
+++ b/frontend/src/hooks/useGraphData.ts
@@ -26,16 +26,16 @@ export const useGraphData = () => {
       
       // 如果后端返回空数据，使用示例数据
       if (data.nodes.length === 0) {
-        setGraphData(SAMPLE_GRAPH_DATA);
+        setGraphData({ ...SAMPLE_GRAPH_DATA, id: `sample-${Date.now()}` });
       } else {
-        setGraphData(data);
+        setGraphData({ ...data, id: `data-${Date.now()}` });
       }
     } catch (error) {
       console.error('Failed to load graph data:', error);
       // 重置颜色分配缓存
       resetColorAssignment();
       // API 失败时使用示例数据作为降级方案
-      setGraphData(SAMPLE_GRAPH_DATA);
+      setGraphData({ ...SAMPLE_GRAPH_DATA, id: `fallback-${Date.now()}` });
     } finally {
       setLoading(false);
     }
@@ -59,17 +59,36 @@ export const useGraphData = () => {
 
   // 通过 ID 选择节点（用于搜索结果点击）
   const handleNodeSelectById = useCallback((nodeId: string) => {
+    console.log('[useGraphData] handleNodeSelectById called with id:', nodeId);
     const node = graphData.nodes.find((n: Node) => n.id === nodeId);
+    console.log('[useGraphData] Found node:', node);
     if (node) {
+      console.log('[useGraphData] Setting selectedNode:', node);
       setSelectedNode(node);
+    } else {
+      console.log('[useGraphData] Node not found with id:', nodeId);
     }
   }, [graphData.nodes]);
 
   // 选择节点（用于图谱点击）
-  const handleNodeSelect = useCallback((node: Node) => {
+  const handleNodeSelect = useCallback((node: Node | null) => {
+    console.log('[useGraphData] handleNodeSelect called with node:', node);
+    console.log('[useGraphData] About to call setSelectedNode');
     setSelectedNode(node);
+    console.log('[useGraphData] setSelectedNode called');
   }, []);
 
+  // 悬停节点（用于图谱悬停）
+  const handleNodeHover = useCallback((node: Node | null) => {
+    setHoveredNode(node);
+  }, []);
+
+  // 监听 selectedNode 变化，用于调试
+  useEffect(() => {
+    console.log('[useGraphData] selectedNode state changed:', selectedNode);
+    console.log('[useGraphData] selectedNode truthiness:', !!selectedNode);
+  }, [selectedNode]);
+
   // 组件挂载时加载数据
   useEffect(() => {
     loadGraphData();
@@ -81,11 +100,10 @@ export const useGraphData = () => {
     hoveredNode,
     searchResults,
     loading,
-    setHoveredNode,
     setSelectedNode,
-    setSearchResults,
     handleSearch,
     handleNodeSelectById,
     handleNodeSelect,
+    handleNodeHover,
   };
 };
diff --git a/frontend/src/pages/KnowledgeGraph.tsx b/frontend/src/pages/KnowledgeGraph.tsx
index 9df7c00..4625f7b 100644
--- a/frontend/src/pages/KnowledgeGraph.tsx
+++ b/frontend/src/pages/KnowledgeGraph.tsx
@@ -1,4 +1,4 @@
-import { useMemo, useState } from 'react';
+import { useMemo } from 'react';
 import GraphView from '../components/GraphView/index';
 import SearchBar from '../components/SearchBar/index';
 import NodePanel from '../components/NodePanel/index';
@@ -18,17 +18,15 @@ export const KnowledgeGraph = () => {
   const {
     graphData,
     selectedNode,
-    hoveredNode,
     searchResults,
     loading,
-    setHoveredNode,
     setSelectedNode,
     handleSearch,
     handleNodeSelectById,
+    handleNodeSelect,
   } = useGraphData();
 
   const { layout } = useGraphLayout();
-  const [isExpanded, setIsExpanded] = useState(false);
 
   const legendData = useMemo(() => {
     if (!graphData || graphData.nodes.length === 0) {
@@ -37,11 +35,6 @@ export const KnowledgeGraph = () => {
     return generateLegendData(graphData);
   }, [graphData]);
 
-  const propertiesList = useMemo(() => {
-    if (!hoveredNode?.properties) return [];
-    return Object.entries(hoveredNode.properties);
-  }, [hoveredNode]);
-
   return (
     <div className="w-full h-screen flex flex-col bg-gray-50">
       {loading ? (
@@ -73,94 +66,19 @@ export const KnowledgeGraph = () => {
               <GraphView
                 data={graphData}
                 layout={layout}
-                onNodeClick={setSelectedNode}
-                onNodeHover={setHoveredNode}
+                onNodeClick={handleNodeSelect}
               />
-              
-              {hoveredNode && (
-                <div className="absolute bottom-4 right-1/2 translate-x-1/2 bg-white/95 backdrop-blur-sm rounded-lg shadow-lg p-4 max-w-md w-80 z-20">
-                  {!isExpanded ? (
-                    <div className="space-y-2">
-                      <div className="flex justify-between items-start">
-                        <div className="font-semibold text-base text-gray-800">{hoveredNode.label}</div>
-                      </div>
-                      {hoveredNode.type && (
-                        <div className="text-xs text-gray-500 bg-gray-100 px-2 py-0.5 rounded inline-block">
-                          {hoveredNode.type}
-                        </div>
-                      )}
-                      {propertiesList.length > 0 && (
-                        <div className="space-y-1 text-xs">
-                          {propertiesList.slice(0, 2).map(([key, value]) => (
-                            <div key={key} className="flex justify-between gap-2">
-                              <span className="text-gray-500 shrink-0">{key}:</span>
-                              <span className="text-gray-800 text-right truncate max-w-[70%]">
-                                {typeof value === 'object' ? JSON.stringify(value) : String(value)}
-                              </span>
-                            </div>
-                          ))}
-                          {propertiesList.length > 2 && (
-                            <div className="text-gray-400 text-center pt-1">还有 {propertiesList.length - 2} 项属性...</div>
-                          )}
-                        </div>
-                      )}
-                      {propertiesList.length > 0 && (
-                        <button 
-                          onClick={() => setIsExpanded(true)}
-                          className="w-full mt-2 py-1.5 text-xs font-medium text-blue-600 hover:text-blue-700 hover:bg-blue-50 rounded transition-colors"
-                        >
-                          展开查看全部 ▼
-                        </button>
-                      )}
-                    </div>
-                  ) : (
-                    <div className="space-y-3">
-                      <div className="flex justify-between items-start">
-                        <div className="font-semibold text-base text-gray-800">{hoveredNode.label}</div>
-                        <button 
-                          onClick={() => setIsExpanded(false)}
-                          className="text-xs text-gray-500 hover:text-gray-700 px-2 py-0.5 hover:bg-gray-100 rounded transition-colors"
-                        >
-                          收起 ▲
-                        </button>
-                      </div>
-                      {hoveredNode.type && (
-                        <div className="text-xs text-gray-500 bg-gray-100 px-2 py-0.5 rounded inline-block">
-                          {hoveredNode.type}
-                        </div>
-                      )}
-                      {propertiesList.length > 0 && (
-                        <div>
-                          <div className="text-xs text-gray-500 uppercase tracking-wide mb-2">
-                            属性 ({propertiesList.length})
-                          </div>
-                          <div className="space-y-1.5 text-xs max-h-40 overflow-y-auto">
-                            {propertiesList.map(([key, value]) => (
-                              <div key={key} className="flex justify-between gap-2 py-0.5">
-                                <span className="text-gray-600 shrink-0">{key}:</span>
-                                <span className="text-gray-800 text-right break-all max-w-[65%]">
-                                  {typeof value === 'object' ? JSON.stringify(value) : String(value)}
-                                </span>
-                              </div>
-                            ))}
-                          </div>
-                        </div>
-                      )}
-                    </div>
-                  )}
-                </div>
-              )}
             </main>
-
-            {selectedNode && (
-              <aside className="w-80 bg-white border-l border-gray-200">
-                <NodePanel 
-                  node={selectedNode} 
-                  onClose={() => setSelectedNode(null)} 
-                />
-              </aside>
-            )}
           </div>
+
+          {selectedNode && (
+            <div className="fixed right-6 top-24 w-96 bg-white rounded-lg shadow-2xl border border-gray-200 z-50">
+              <NodePanel 
+                node={selectedNode} 
+                onClose={() => setSelectedNode(null)} 
+              />
+            </div>
+          )}
         </>
       )}
     </div>
diff --git a/frontend/src/types/graph.ts b/frontend/src/types/graph.ts
index 220b99d..6730ab9 100644
--- a/frontend/src/types/graph.ts
+++ b/frontend/src/types/graph.ts
@@ -46,6 +46,7 @@ export interface Edge {
 export interface GraphData {
   nodes: Node[];
   edges: Edge[];
+  id?: string;
 }
 
 /**