diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 3e56d752..fdab7ac4 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -1435,7 +1435,6 @@
       "resolved": "https://registry.npmjs.org/d3-selection/-/d3-selection-3.0.0.tgz",
       "integrity": "sha512-fmTRWbNMmsmWq6xJV8D19U/gw/bwrHfNXxrIN+HfZgnzqTHp9jOmKMhsTUjXOJnZOdZY9Q28y4yebKzqDKlxlQ==",
       "license": "ISC",
-      "peer": true,
       "engines": {
         "node": ">=12"
       }
@@ -1913,7 +1912,6 @@
       "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -2053,7 +2051,6 @@
       "integrity": "sha512-ITcnkFeR3+fI8P1wMgItjGrR10170d8auB4EpMLPqmx6uxElH3a/hHGQabSHKdqd4FXWO1nFIp9rRn7JQ34ACQ==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.25.0",
         "fdir": "^6.5.0",
@@ -2128,7 +2125,6 @@
       "resolved": "https://registry.npmjs.org/vue/-/vue-3.5.25.tgz",
       "integrity": "sha512-YLVdgv2K13WJ6n+kD5owehKtEXwdwXuj2TTyJMsO7pSeKw2bfRNZGjhB7YzrpbMYj5b5QsUebHpOqR3R3ziy/g==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@vue/compiler-dom": "3.5.25",
         "@vue/compiler-sfc": "3.5.25",
diff --git a/frontend/src/components/Step1GraphBuild.vue b/frontend/src/components/Step1GraphBuild.vue
index 687d1c7b..990f3e05 100644
--- a/frontend/src/components/Step1GraphBuild.vue
+++ b/frontend/src/components/Step1GraphBuild.vue
@@ -10,6 +10,7 @@
           </div>
           <div class="step-status">
             <span v-if="currentPhase > 0" class="badge success">{{ $t('step1.ontologyCompleted') }}</span>
+            <span v-else-if="errorMsg && currentPhase === 0" class="badge error">FAILED</span>
             <span v-else-if="currentPhase === 0" class="badge processing">{{ $t('step1.ontologyGenerating') }}</span>
             <span v-else class="badge pending">{{ $t('step1.ontologyPending') }}</span>
           </div>
@@ -22,10 +23,16 @@
           </p>
 
           <!-- Loading / Progress -->
-          <div v-if="currentPhase === 0 && ontologyProgress" class="progress-section">
+          <div v-if="currentPhase === 0 && ontologyProgress && !errorMsg" class="progress-section">
             <div class="spinner-sm"></div>
             <span>{{ ontologyProgress.message || $t('step1.analyzingDocs') }}</span>
           </div>
+          
+          <!-- Error Alert for Phase 0 -->
+          <div v-if="currentPhase === 0 && errorMsg" class="error-alert">
+            <span class="error-icon">⚠️</span>
+            <span class="error-text">{{ errorMsg }}</span>
+          </div>
 
           <!-- Detail Overlay -->
           <div v-if="selectedOntologyItem" class="ontology-detail-overlay">
@@ -114,6 +121,7 @@
           </div>
           <div class="step-status">
             <span v-if="currentPhase > 1" class="badge success">{{ $t('step1.ontologyCompleted') }}</span>
+            <span v-else-if="errorMsg && currentPhase === 1" class="badge error">FAILED</span>
             <span v-else-if="currentPhase === 1" class="badge processing">{{ buildProgress?.progress || 0 }}%</span>
             <span v-else class="badge pending">{{ $t('step1.ontologyPending') }}</span>
           </div>
@@ -125,6 +133,12 @@
             {{ $t('step1.graphRagDesc') }}
           </p>
           
+          <!-- Error Alert for Phase 1 -->
+          <div v-if="currentPhase === 1 && errorMsg" class="error-alert" style="margin-bottom: 16px;">
+            <span class="error-icon">⚠️</span>
+            <span class="error-text">{{ errorMsg }}</span>
+          </div>
+          
           <!-- Stats Cards -->
           <div class="stats-grid">
             <div class="stat-card">
@@ -201,7 +215,8 @@ const props = defineProps({
   ontologyProgress: Object,
   buildProgress: Object,
   graphData: Object,
-  systemLogs: { type: Array, default: () => [] }
+  systemLogs: { type: Array, default: () => [] },
+  errorMsg: { type: String, default: '' }
 })
 
 defineEmits(['next-step'])
@@ -349,6 +364,7 @@ watch(() => props.systemLogs.length, () => {
 .badge.processing { background: #FF5722; color: #FFF; }
 .badge.accent { background: #FF5722; color: #FFF; }
 .badge.pending { background: #F5F5F5; color: #999; }
+.badge.error { background: #FFEBEE; color: #D32F2F; }
 
 .api-note {
   font-family: 'JetBrains Mono', monospace;
@@ -364,6 +380,28 @@ watch(() => props.systemLogs.length, () => {
   margin-bottom: 16px;
 }
 
+.error-alert {
+  display: flex;
+  align-items: flex-start;
+  gap: 8px;
+  background: #FFF5F5;
+  border: 1px solid #FFCDD2;
+  border-radius: 6px;
+  padding: 12px;
+  margin-top: 8px;
+}
+
+.error-icon {
+  font-size: 14px;
+}
+
+.error-text {
+  font-size: 12px;
+  color: #C62828;
+  line-height: 1.4;
+  word-break: break-word;
+}
+
 /* Step 01 Tags */
 .tags-container {
   margin-top: 12px;
diff --git a/frontend/src/views/MainView.vue b/frontend/src/views/MainView.vue
index 513c70d8..e8c48bd6 100644
--- a/frontend/src/views/MainView.vue
+++ b/frontend/src/views/MainView.vue
@@ -59,6 +59,7 @@
           :buildProgress="buildProgress"
           :graphData="graphData"
           :systemLogs="systemLogs"
+          :errorMsg="error"
           @next-step="handleNextStep"
         />
         <!-- Step 2: 环境搭建 -->
@@ -83,7 +84,7 @@ import { useI18n } from 'vue-i18n'
 import GraphPanel from '../components/GraphPanel.vue'
 import Step1GraphBuild from '../components/Step1GraphBuild.vue'
 import Step2EnvSetup from '../components/Step2EnvSetup.vue'
-import { generateOntology, getProject, buildGraph, getTaskStatus, getGraphData } from '../api/graph'
+import { generateOntology, getProject, buildGraph, getTaskStatus, getGraphData, getGraphConfig } from '../api/graph'
 import { getPendingUpload, clearPendingUpload } from '../store/pendingUpload'
 import LanguageSwitcher from '../components/LanguageSwitcher.vue'
 
@@ -114,6 +115,9 @@ const systemLogs = ref([])
 let pollTimer = null
 let graphPollTimer = null
 
+// Graph polling config (fetched from backend)
+const graphPollInterval = ref(0) // 0 = manual only
+
 // --- Computed Layout Styles ---
 const leftPanelStyle = computed(() => {
   if (viewMode.value === 'graph') return { width: '100%', opacity: 1, transform: 'translateX(0)' }
@@ -184,6 +188,19 @@ const handleGoBack = () => {
 
 const initProject = async () => {
   addLog('Project view initialized.')
+  
+  // Fetch graph polling config from backend
+  try {
+    const configRes = await getGraphConfig()
+    if (configRes.success && configRes.data) {
+      graphPollInterval.value = configRes.data.poll_interval || 0
+      addLog(`Graph config loaded: poll_interval=${graphPollInterval.value}s, cache_ttl=${configRes.data.cache_ttl}s`)
+    }
+  } catch (err) {
+    addLog('Could not load graph config, defaulting to manual refresh only.')
+    graphPollInterval.value = 0
+  }
+  
   if (currentProjectId.value === 'new') {
     await handleNewProject()
   } else {
@@ -295,9 +312,17 @@ const startBuildGraph = async () => {
 }
 
 const startGraphPolling = () => {
-  addLog('Started polling for graph data...')
+  // Always do one immediate fetch
   fetchGraphData()
-  graphPollTimer = setInterval(fetchGraphData, 10000)
+  
+  // Only set up automatic polling if poll_interval > 0 (paid plan)
+  if (graphPollInterval.value > 0) {
+    const intervalMs = graphPollInterval.value * 1000
+    addLog(`Started automatic graph polling (every ${graphPollInterval.value}s)...`)
+    graphPollTimer = setInterval(fetchGraphData, intervalMs)
+  } else {
+    addLog('Automatic graph polling disabled (FREE plan). Use manual refresh.')
+  }
 }
 
 const fetchGraphData = async () => {
diff --git a/frontend/src/views/Process.vue b/frontend/src/views/Process.vue
index 2d2d3cc1..591c5473 100644
--- a/frontend/src/views/Process.vue
+++ b/frontend/src/views/Process.vue
@@ -414,7 +414,7 @@
 <script setup>
 import { ref, computed, onMounted, onUnmounted, watch, nextTick } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { generateOntology, getProject, buildGraph, getTaskStatus, getGraphData } from '../api/graph'
+import { generateOntology, getProject, buildGraph, getTaskStatus, getGraphData, getGraphConfig } from '../api/graph'
 import { getPendingUpload, clearPendingUpload } from '../store/pendingUpload'
 import * as d3 from 'd3'
 
@@ -443,6 +443,9 @@ const graphSvg = ref(null)
 // 轮询定时器
 let pollTimer = null
 
+// Graph polling config (fetched from backend)
+const graphPollInterval = ref(0) // 0 = manual only
+
 // 计算属性
 const statusClass = computed(() => {
   if (error.value) return 'error'
@@ -554,6 +557,16 @@ const getPhaseStatusText = (phase) => {
 const initProject = async () => {
   const paramProjectId = route.params.projectId
   
+  // Fetch graph polling config from backend
+  try {
+    const configRes = await getGraphConfig()
+    if (configRes.success && configRes.data) {
+      graphPollInterval.value = configRes.data.poll_interval || 0
+    }
+  } catch (err) {
+    graphPollInterval.value = 0
+  }
+  
   if (paramProjectId === 'new') {
     // 新建项目：从 store 获取待上传的数据
     await handleNewProject()
@@ -715,10 +728,13 @@ const startGraphPolling = () => {
   // 立即获取一次
   fetchGraphData()
   
-  // 每 10 秒自动获取一次图谱数据
-  graphPollTimer = setInterval(async () => {
-    await fetchGraphData()
-  }, 10000)
+  // Only set up automatic polling if poll_interval > 0 (paid plan)
+  if (graphPollInterval.value > 0) {
+    const intervalMs = graphPollInterval.value * 1000
+    graphPollTimer = setInterval(async () => {
+      await fetchGraphData()
+    }, intervalMs)
+  }
 }
 
 // 手动刷新图谱
diff --git a/frontend/src/views/SimulationRunView.vue b/frontend/src/views/SimulationRunView.vue
index c675d877..60cee52f 100644
--- a/frontend/src/views/SimulationRunView.vue
+++ b/frontend/src/views/SimulationRunView.vue
@@ -73,7 +73,7 @@ import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import GraphPanel from '../components/GraphPanel.vue'
 import Step3Simulation from '../components/Step3Simulation.vue'
-import { getProject, getGraphData } from '../api/graph'
+import { getProject, getGraphData, getGraphConfig } from '../api/graph'
 import { getSimulation, getSimulationConfig, stopSimulation, closeSimulationEnv, getEnvStatus } from '../api/simulation'
 import LanguageSwitcher from '../components/LanguageSwitcher.vue'
 import { useI18n } from 'vue-i18n'
@@ -100,6 +100,7 @@ const graphData = ref(null)
 const graphLoading = ref(false)
 const systemLogs = ref([])
 const currentStatus = ref('processing') // processing | completed | error
+const graphPollInterval = ref(0) // 0 = manual only
 
 // --- Computed Layout Styles ---
 const leftPanelStyle = computed(() => {
@@ -208,6 +209,16 @@ const loadSimulationData = async () => {
   try {
     addLog(t('log.loadingSimData', { id: currentSimulationId.value }))
     
+    // Fetch graph polling config from backend
+    try {
+      const configRes = await getGraphConfig()
+      if (configRes.success && configRes.data) {
+        graphPollInterval.value = configRes.data.poll_interval || 0
+      }
+    } catch (err) {
+      graphPollInterval.value = 0
+    }
+    
     // 获取 simulation 信息
     const simRes = await getSimulation(currentSimulationId.value)
     if (simRes.success && simRes.data) {
@@ -278,9 +289,15 @@ let graphRefreshTimer = null
 
 const startGraphRefresh = () => {
   if (graphRefreshTimer) return
-  addLog(t('log.graphRealtimeRefreshStart'))
-  // 立即刷新一次，然后每30秒刷新
-  graphRefreshTimer = setInterval(refreshGraph, 30000)
+  
+  // Only set up automatic refresh if poll_interval > 0 (paid plan)
+  if (graphPollInterval.value > 0) {
+    const intervalMs = Math.max(graphPollInterval.value * 1000, 30000) // At least 30s during simulation
+    addLog(t('log.graphRealtimeRefreshStart'))
+    graphRefreshTimer = setInterval(refreshGraph, intervalMs)
+  } else {
+    addLog('Automatic graph refresh disabled (FREE plan). Use manual refresh.')
+  }
 }
 
 const stopGraphRefresh = () => {