diff --git a/web/src/components/FileTable.vue b/web/src/components/FileTable.vue
index f54f4b0a..c3ef2d7e 100644
--- a/web/src/components/FileTable.vue
+++ b/web/src/components/FileTable.vue
@@ -372,6 +372,7 @@ import { parseToShanghai } from '@/utils/time';
 <style scoped>
 .file-table-container {
   display: flex;
+  flex-grow: 1;
   flex-direction: column;
   max-height: 100%;
   overflow: hidden;
diff --git a/web/src/components/KnowledgeGraphSection.vue b/web/src/components/KnowledgeGraphSection.vue
index bab8703a..6eb05436 100644
--- a/web/src/components/KnowledgeGraphSection.vue
+++ b/web/src/components/KnowledgeGraphSection.vue
@@ -2,32 +2,11 @@
   <div class="graph-section" v-if="isGraphSupported">
     <div class="graph-toolbar">
       <div class="toolbar-left">
-        <div v-if="graphStats.displayed_nodes > 0 || graphStats.displayed_edges > 0" class="graph-stats">
-          <a-tag color="blue" size="small">节点: {{ graphStats.displayed_nodes }}</a-tag>
-          <a-tag color="green" size="small">边: {{ graphStats.displayed_edges }}</a-tag>
+        <div class="graph-stats">
+          <a-tag color="blue" size="small">总节点: {{ graphStats.total_nodes || 0 }}</a-tag>
+          <a-tag color="green" size="small">总边: {{ graphStats.total_edges || 0 }}</a-tag>
         </div>
       </div>
-      <div class="toolbar-right">
-        <a-button
-          type="primary"
-          size="small"
-          @click="loadGraph"
-          :disabled="!isGraphSupported"
-          :icon='h(ReloadOutlined)'
-        >
-          加载图谱
-        </a-button>
-        <a-button
-          type="text"
-          size="small"
-          :icon="h(ExpandOutlined)"
-          title="最大化"
-          @click="toggleGraphMaximize"
-          :disabled="!isGraphSupported"
-        >
-          最大化
-        </a-button>
-      </div>
     </div>
     <div class="graph-container-compact">
       <div v-if="!isGraphSupported" class="graph-disabled">
@@ -41,12 +20,10 @@
         v-else
         :initial-database-id="databaseId"
         :hide-db-selector="true"
-        :hide-stats="true"
-        :hide-controls="!store.state.isGraphMaximized"
         :initial-limit="graphLimit"
         :initial-depth="graphDepth"
-        @update:stats="handleStatsUpdate"
         ref="graphViewerRef"
+        @update:stats="handleViewerStats"
       />
     </div>
 
@@ -115,7 +92,7 @@
 <script setup>
 import { ref, computed, watch, nextTick, onUnmounted } from 'vue';
 import { useDatabaseStore } from '@/stores/database';
-import { ReloadOutlined, ExpandOutlined } from '@ant-design/icons-vue';
+import { ReloadOutlined } from '@ant-design/icons-vue';
 import KnowledgeGraphViewer from '@/components/KnowledgeGraphViewer.vue';
 import { h } from 'vue';
 import { getKbTypeLabel } from '@/utils/kb_utils';
@@ -139,7 +116,7 @@ const graphStats = computed({
 
 const graphViewerRef = ref(null);
 const showSettings = ref(false);
-const graphLimit = ref(200);
+const graphLimit = ref(50);
 const graphDepth = ref(2);
 
 const showExportModal = ref(false);
@@ -168,14 +145,6 @@ const clearGraph = () => {
   }
 };
 
-const toggleGraphMaximize = () => {
-  store.state.isGraphMaximized = !store.state.isGraphMaximized;
-};
-
-const handleStatsUpdate = (stats) => {
-  graphStats.value = stats;
-};
-
 const applySettings = () => {
   showSettings.value = false;
   // 设置已通过props传递给子组件，不需要额外操作
@@ -241,6 +210,20 @@ const scheduleGraphLoad = (delay = 200) => {
   }, delay);
 };
 
+// 处理子组件（Viewer）上报的统计信息，将其写入 database store 的 graphStats
+const handleViewerStats = (stats) => {
+  if (!stats) return;
+
+  // 合并现有 store.graphStats，优先使用来自 viewer 的值
+  store.graphStats = {
+    total_nodes: stats.total_nodes ?? store.graphStats.total_nodes ?? 0,
+    total_edges: stats.total_edges ?? store.graphStats.total_edges ?? 0,
+    displayed_nodes: stats.displayed_nodes ?? store.graphStats.displayed_nodes ?? 0,
+    displayed_edges: stats.displayed_edges ?? store.graphStats.displayed_edges ?? 0,
+    is_truncated: stats.is_truncated ?? store.graphStats.is_truncated ?? false,
+  }
+}
+
 watch(
   () => props.active,
   (active) => {
@@ -252,13 +235,17 @@ watch(
 );
 
 watch(databaseId, () => {
+  store.graphStats = defaultGraphStats();
   scheduleGraphLoad(300);
 });
 
 watch(isGraphSupported, (supported) => {
-  if (supported) {
-    scheduleGraphLoad(200);
+  if (!supported) {
+    store.graphStats = defaultGraphStats();
+    clearGraph();
+    return;
   }
+  scheduleGraphLoad(200);
 });
 
 onUnmounted(() => {
diff --git a/web/src/components/KnowledgeGraphViewer.vue b/web/src/components/KnowledgeGraphViewer.vue
index 041fba7b..5c804e6a 100644
--- a/web/src/components/KnowledgeGraphViewer.vue
+++ b/web/src/components/KnowledgeGraphViewer.vue
@@ -71,24 +71,8 @@
         >
           <SearchOutlined v-if="!loading" /> 加载图谱
         </a-button>
-        <a-button
-          type="default"
-          size="small"
-          :loading="loading"
-          @click="loadTestData"
-          :disabled="!selectedDatabase"
-          style="margin-left: 6px"
-          title="加载测试数据（用于演示图谱功能）"
-        >
-          <ReloadOutlined v-if="!loading" /> 测试数据
-        </a-button>
       </div>
 
-      <div v-if="!props.hideStats" class="stats-section">
-        <a-tag color="blue" size="small">节点: {{ stats.displayed_nodes || 0 }}</a-tag>
-        <a-tag color="green" size="small">边: {{ stats.displayed_edges || 0 }}</a-tag>
-        <!-- <a-tag v-if="stats.is_truncated" color="red" size="small">已截断</a-tag> -->
-      </div>
     </div>
 
     <!-- Sigma.js图可视化容器 -->
@@ -98,6 +82,11 @@
       :class="{ 'loading': loading }"
     ></div>
 
+    <div v-if="!props.hideStats" class="graph-overlay-stats">
+      <a-tag color="blue" size="small">节点: {{ stats.displayed_nodes || 0 }}</a-tag>
+      <a-tag color="green" size="small">边: {{ stats.displayed_edges || 0 }}</a-tag>
+    </div>
+
     <!-- 节点详情面板 -->
     <div
       v-if="selectedNodeData"
@@ -234,7 +223,6 @@ import { ref, reactive, onMounted, onUnmounted, computed, watch, nextTick } from
 import { message } from 'ant-design-vue'
 import {
   SearchOutlined,
-  ReloadOutlined,
   ClearOutlined,
   CloseOutlined,
   PlusOutlined,
@@ -248,6 +236,7 @@ import { EdgeArrowProgram } from 'sigma/rendering'
 
 import { lightragApi } from '@/apis/graph_api'
 import { useGraphStore } from '@/stores/graphStore'
+import { useDatabaseStore } from '@/stores/database'
 import '@/assets/css/sigma.css'
 
 // 定义 props
@@ -283,6 +272,7 @@ const emit = defineEmits(['update:stats', 'refresh-graph', 'clear-graph'])
 
 // 状态管理
 const graphStore = useGraphStore()
+const databaseStore = useDatabaseStore()
 
 // 响应式引用
 const loading = ref(false)
@@ -714,9 +704,13 @@ const loadGraphData = async () => {
 
       // 设置图数据
       graphStore.setRawGraph(rawGraph)
+      // 更新 displayed 计数（当前视图）以及来自后端的 total 计数（整个库）
       graphStore.stats = {
         displayed_nodes: graphResponse.data.nodes.length,
         displayed_edges: graphResponse.data.edges.length,
+        // 从 statsResponse 填充整个知识库的统计信息（后端返回 total_nodes/total_edges）
+        total_nodes: statsResponse.data.total_nodes ?? graphStore.stats.total_nodes ?? 0,
+        total_edges: statsResponse.data.total_edges ?? graphStore.stats.total_edges ?? 0,
         is_truncated: graphResponse.data.is_truncated
       }
 
@@ -755,82 +749,6 @@ const loadGraphData = async () => {
   }
 }
 
-// 加载测试数据
-const loadTestData = async () => {
-  if (!selectedDatabase.value) {
-    message.warning('请先选择数据库')
-    return
-  }
-
-  loading.value = true
-  loadingMessage.value = '加载测试数据中...'
-
-  try {
-    const response = await fetch(`/api/graph/lightrag/test-data?db_id=${selectedDatabase.value}`, {
-      headers: {
-        'Authorization': `Bearer ${localStorage.getItem('access_token')}`,
-        'Content-Type': 'application/json'
-      }
-    })
-
-    if (!response.ok) {
-      throw new Error(`HTTP ${response.status}: ${response.statusText}`)
-    }
-
-    const testData = await response.json()
-
-    if (testData.success) {
-      // 创建图数据
-      const rawGraph = graphStore.createGraphFromApiData(
-        testData.data.nodes,
-        testData.data.edges
-      )
-
-      // 设置图数据
-      graphStore.setRawGraph(rawGraph)
-      graphStore.stats = {
-        displayed_nodes: testData.data.nodes.length,
-        displayed_edges: testData.data.edges.length,
-        is_truncated: testData.data.is_truncated
-      }
-
-      console.log('Test graph created:', {
-        nodes: rawGraph.nodes.length,
-        edges: rawGraph.edges.length,
-        sampleNode: rawGraph.nodes[0],
-        sampleEdge: rawGraph.edges[0]
-      })
-
-      // 创建Sigma图
-      const sigmaGraph = graphStore.createSigmaGraph(rawGraph)
-      graphStore.setSigmaGraph(sigmaGraph)
-
-      // 应用布局
-      await applyLayout(sigmaGraph)
-
-      // 更新Sigma实例
-      if (sigmaInstance) {
-        sigmaInstance.setGraph(sigmaGraph)
-        sigmaInstance.refresh()
-      } else {
-        await nextTick()
-        await initSigma()
-      }
-
-      message.success(`测试数据加载成功：${rawGraph.nodes.length} 个节点，${rawGraph.edges.length} 条边`)
-    } else {
-      throw new Error('Failed to load test data')
-    }
-
-  } catch (error) {
-    console.error('加载测试数据失败:', error)
-    message.error('加载测试数据失败: ' + error.message)
-  } finally {
-    loading.value = false
-    loadingMessage.value = '加载图数据中...'
-  }
-}
-
 // 加载完整图数据
 const loadFullGraph = async () => {
   selectedLabel.value = '*'
@@ -1277,7 +1195,7 @@ defineExpose({
 
 .control-panel {
   background: white;
-  padding: 8px 0; /* Reduced from 16px */
+  padding: 6px 16px; /* Reduced from 16px */
   border-bottom: none;
   display: flex;
   gap: 12px; /* Reduced from 16px */
@@ -1301,9 +1219,9 @@ defineExpose({
 
 .sigma-container {
   flex: 1;
-  background: white;
+  // background: white;
   position: relative; /* 确保子元素可以相对于此容器定位 */
-  border: 1px solid var(--main-20);
+  // border: 1px solid var(--main-20);
   border-radius: 8px;
   overflow: hidden;
 
@@ -1312,6 +1230,16 @@ defineExpose({
   }
 }
 
+.graph-overlay-stats {
+  position: absolute;
+  left: 16px;
+  bottom: 16px;
+  display: flex;
+  gap: 8px;
+  pointer-events: none;
+  z-index: 1100;
+}
+
 .detail-panel {
   position: absolute;
   width: 240px; /* Reduced from 300px */
@@ -1546,4 +1474,4 @@ defineExpose({
     font-size: 12px; /* Added smaller font size */
   }
 }
-</style>
\ No newline at end of file
+</style>
diff --git a/web/src/stores/database.js b/web/src/stores/database.js
index 678a39d1..ef089f5d 100644
--- a/web/src/stores/database.js
+++ b/web/src/stores/database.js
@@ -18,6 +18,8 @@ export const useDatabaseStore = defineStore('database', () => {
   const queryParams = ref([]);
   const meta = reactive({});
   const graphStats = ref({
+    total_nodes: 0,
+    total_edges: 0,
     displayed_nodes: 0,
     displayed_edges: 0,
     is_truncated: false,
@@ -35,7 +37,6 @@ export const useDatabaseStore = defineStore('database', () => {
     chunkLoading: false,
     autoRefresh: false,
     queryParamsLoading: false,
-    isGraphMaximized: false,
     rightPanelVisible: true,
   });
 
diff --git a/web/src/views/DataBaseInfoView.vue b/web/src/views/DataBaseInfoView.vue
index e304f937..55887bb7 100644
--- a/web/src/views/DataBaseInfoView.vue
+++ b/web/src/views/DataBaseInfoView.vue
@@ -1,38 +1,5 @@
 <template>
 <div class="database-info-container">
-  <!-- Maximize Graph Modal -->
-  <a-modal
-    v-model:open="isGraphMaximized"
-    :footer="null"
-    :closable="false"
-    width="100%"
-    wrap-class-name="full-modal"
-    :mask-closable="false"
-  >
-    <template #title>
-      <div class="maximized-graph-header">
-        <h3>知识图谱 (最大化)</h3>
-        <a-button type="text" @click="toggleGraphMaximize">
-          <CompressOutlined /> 退出最大化
-        </a-button>
-      </div>
-    </template>
-    <div class="maximized-graph-content">
-      <div v-if="!isGraphSupported" class="graph-disabled">
-        <div class="disabled-content">
-          <h4>知识图谱不可用</h4>
-          <p>当前知识库类型 "{{ getKbTypeLabel(database.kb_type || 'lightrag') }}" 不支持知识图谱功能。</p>
-          <p>只有 LightRAG 类型的知识库支持知识图谱。</p>
-        </div>
-      </div>
-      <KnowledgeGraphViewer
-        v-else-if="isGraphMaximized"
-        :initial-database-id="databaseId"
-        :hide-db-selector="true"
-      />
-    </div>
-  </a-modal>
-
   <FileDetailModal />
 
   <FileUploadModal
@@ -79,9 +46,6 @@
 import { onMounted, reactive, ref, watch, onUnmounted, computed } from 'vue';
 import { useRoute } from 'vue-router';
 import { useDatabaseStore } from '@/stores/database';
-import { getKbTypeLabel } from '@/utils/kb_utils';
-import { CompressOutlined } from '@ant-design/icons-vue';
-import KnowledgeGraphViewer from '@/components/KnowledgeGraphViewer.vue';
 import KnowledgeBaseCard from '@/components/KnowledgeBaseCard.vue';
 import FileTable from '@/components/FileTable.vue';
 import FileDetailModal from '@/components/FileDetailModal.vue';
@@ -96,11 +60,6 @@ const store = useDatabaseStore();
 const databaseId = computed(() => store.databaseId);
 const database = computed(() => store.database);
 const state = computed(() => store.state);
-const isGraphMaximized = computed({
-    get: () => store.state.isGraphMaximized,
-    set: (val) => store.state.isGraphMaximized = val
-});
-
 // 计算属性：是否支持知识图谱
 const isGraphSupported = computed(() => {
   const kbType = database.value.kb_type?.toLowerCase();
@@ -110,15 +69,34 @@ const isGraphSupported = computed(() => {
 // Tab 切换逻辑 - 智能默认
 const activeTab = ref('query');
 
+
+const resetGraphStats = () => {
+  store.graphStats = {
+    total_nodes: 0,
+    total_edges: 0,
+    displayed_nodes: 0,
+    displayed_edges: 0,
+    is_truncated: false
+  };
+};
+
+
 // LightRAG 默认展示知识图谱
 watch(
   () => [databaseId.value, isGraphSupported.value],
   ([newDbId, supported], oldValue = []) => {
     const [oldDbId, previouslySupported] = oldValue;
+
     if (!newDbId) {
       return;
     }
 
+    if (newDbId && newDbId !== oldDbId) {
+      resetGraphStats();
+    } else if (!supported && previouslySupported) {
+      resetGraphStats();
+    }
+
     if (supported && (newDbId !== oldDbId || previouslySupported === false || previouslySupported === undefined)) {
       activeTab.value = 'graph';
       return;
@@ -149,11 +127,7 @@ const showAddFilesModal = () => {
   addFilesModalVisible.value = true;
 };
 
-// 切换图谱最大化状态
-const toggleGraphMaximize = () => {
-  isGraphMaximized.value = !isGraphMaximized.value;
-};
-
+// 重置文件选中状态
 const resetFileSelectionState = () => {
   store.selectedRowKeys = [];
   store.selectedFile = null;
@@ -163,6 +137,7 @@ const resetFileSelectionState = () => {
 watch(() => route.params.database_id, async (newId) => {
     store.databaseId = newId;
     resetFileSelectionState();
+    resetGraphStats();
     store.stopAutoRefresh();
     await store.getDatabaseInfo(newId, false); // Explicitly load query params on initial load
     store.startAutoRefresh();
@@ -360,47 +335,6 @@ const handleMouseUp = () => {
 </style>
 
 <style lang="less">
-:deep(.full-modal) {
-  .ant-modal {
-    max-width: 100%;
-    top: 0;
-    padding-bottom: 0;
-    margin: 0;
-    padding: 0;
-  }
-
-  .ant-modal-content {
-    display: flex;
-    flex-direction: column;
-    height: calc(100vh - 200px);
-  }
-
-  .ant-modal-body {
-    flex: 1;
-  }
-}
-
-
-
-.maximized-graph-header {
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-
-  h3 {
-    margin: 0;
-    color: var(--gray-800);
-  }
-}
-
-
-.maximized-graph-content {
-  height: calc(100vh - 300px);
-  border-radius: 6px;
-  overflow: hidden;
-}
-
-
 /* 全局样式作为备用方案 */
 .ant-popover .query-params-compact {
   width: 220px;