diff --git a/editor/App.vue b/editor/App.vue
index d9cd484..081b5ab 100644
--- a/editor/App.vue
+++ b/editor/App.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, computed, watch, onMounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import type { GameData, SceneNode } from '@engine/types'
 import { useGraphEditor } from './composables/useGraphEditor'
 import SceneGraph from './components/SceneGraph.vue'
@@ -9,73 +9,18 @@ import PreviewPanel from './components/PreviewPanel.vue'
 const editor = useGraphEditor()
 const dirty = ref(false)
 const fileInputRef = ref<HTMLInputElement | null>(null)
-
-const sceneNodes = computed(() => {
-  return Object.values(editor.gameData.value.scenes).map((s) => ({
-    id: s.id,
-    label: s.id,
-  }))
-})
-
-const sceneEdges = computed(() => {
-  const edges: { id: string; source: string; target: string; label?: string }[] = []
-  for (const [id, scene] of Object.entries(editor.gameData.value.scenes)) {
-    if (scene.choices) {
-      let ci = 0
-      for (const c of scene.choices) {
-        if (c.targetScene) {
-          edges.push({
-            id: `${id}_choice_${ci}`,
-            source: id,
-            target: c.targetScene,
-            label: c.text.slice(0, 10),
-          })
-        }
-        ci++
-      }
-    }
-    if (scene.nextScene) {
-      edges.push({
-        id: `${id}_next`,
-        source: id,
-        target: scene.nextScene,
-        label: '→ 默认',
-      })
-    }
-    if (scene.qte) {
-      if (scene.qte.successScene) {
-        edges.push({
-          id: `${id}_qte_s`,
-          source: id,
-          target: scene.qte.successScene,
-          label: 'QTE成功',
-        })
-      }
-      if (scene.qte.failScene) {
-        edges.push({
-          id: `${id}_qte_f`,
-          source: id,
-          target: scene.qte.failScene,
-          label: 'QTE失败',
-        })
-      }
-    }
-  }
-  return edges
-})
+const loading = ref(true)
+const error = ref('')
 
 const selectedScene = computed<SceneNode | null>(() => {
   if (!editor.selectedNodeId.value) return null
   return editor.gameData.value.scenes[editor.selectedNodeId.value] ?? null
 })
 
-const sceneList = computed(() => editor.sceneList.value)
-
 const previewVideoUrl = computed(() => {
-  if (!selectedScene.value?.videoUrl) return null
-  const url = selectedScene.value.videoUrl
-  if (url.startsWith('/')) return url
-  return '/' + url
+  const url = selectedScene.value?.videoUrl
+  if (!url) return null
+  return url.startsWith('/') ? url : '/' + url
 })
 
 function newNode() {
@@ -112,16 +57,15 @@ function onDeleteChoice(sourceId: string, index: number) {
 function onAddEdge(source: string, target: string) {
   const scene = editor.gameData.value.scenes[source]
   if (!scene) return
-  if (!scene.choices) scene.choices = []
-  scene.choices.push({
-    text: `${source} → ${target}`,
-    targetScene: target,
-  })
-  editor.gameData.value.scenes = { ...editor.gameData.value.scenes }
+  const newChoices = [...(scene.choices || []), { text: `${source} → ${target}`, targetScene: target }]
+  editor.gameData.value = {
+    ...editor.gameData.value,
+    scenes: { ...editor.gameData.value.scenes, [source]: { ...scene, choices: newChoices } },
+  }
   dirty.value = true
 }
 
-async function exportJSON() {
+function exportJSON() {
   const data = editor.exportJSON()
   const json = JSON.stringify(data, null, 2)
   const blob = new Blob([json], { type: 'application/json' })
@@ -141,21 +85,29 @@ function importJSON() {
 async function onFileSelected(e: Event) {
   const file = (e.target as HTMLInputElement).files?.[0]
   if (!file) return
-  const text = await file.text()
   try {
-    const data = JSON.parse(text) as GameData
+    const data = JSON.parse(await file.text()) as GameData
+    if (!data.scenes || typeof data.scenes !== 'object') throw new Error('无效的场景数据')
     editor.loadJSON(data)
     dirty.value = false
-  } catch (err) {
-    alert('JSON 解析失败：' + (err as Error).message)
+  } catch (err: any) {
+    error.value = '导入失败：' + err.message
+    setTimeout(() => (error.value = ''), 3000)
   }
 }
 
 async function loadDemo() {
-  const resp = await fetch('/scenes/demo.json')
-  const data = await resp.json()
-  editor.loadJSON(data)
-  dirty.value = false
+  try {
+    loading.value = true
+    const resp = await fetch('/scenes/demo.json')
+    if (!resp.ok) throw new Error('HTTP ' + resp.status)
+    editor.loadJSON(await resp.json())
+    dirty.value = false
+  } catch (err: any) {
+    error.value = '加载示例失败：' + err.message
+  } finally {
+    loading.value = false
+  }
 }
 
 onMounted(() => {
@@ -182,25 +134,30 @@ onMounted(() => {
           class="start-select"
         >
           <option value="">-- 选择 --</option>
-          <option v-for="n in sceneNodes" :key="n.id" :value="n.id">{{ n.label }}</option>
+          <option v-for="n in editor.sceneNodes.value" :key="n.id" :value="n.id">{{ n.label }}</option>
         </select>
       </span>
     </div>
 
+    <div v-if="error" class="error-bar">{{ error }}</div>
+
     <div class="editor-main">
       <SceneGraph
+        v-if="!loading"
         class="graph-area"
-        :scene-nodes="sceneNodes"
-        :scene-edges="sceneEdges"
+        :scene-nodes="editor.sceneNodes.value"
+        :scene-edges="editor.sceneEdges.value"
         :start-scene="editor.startSceneId.value"
         :selected-node-id="editor.selectedNodeId.value"
         @select-node="editor.selectedNodeId.value = $event"
         @add-edge="onAddEdge"
       />
 
+      <div v-else class="graph-area loading-hint">加载剧情数据…</div>
+
       <NodeEditor
         :scene="selectedScene"
-        :scene-list="sceneList"
+        :scene-list="editor.sceneList.value"
         @update="onUpdateScene"
         @add-choice="onAddChoice"
         @update-choice="onUpdateChoice"
@@ -212,13 +169,7 @@ onMounted(() => {
       <PreviewPanel :video-url="previewVideoUrl" />
     </div>
 
-    <input
-      ref="fileInputRef"
-      type="file"
-      accept=".json"
-      style="display:none"
-      @change="onFileSelected"
-    />
+    <input ref="fileInputRef" type="file" accept=".json" style="display:none" @change="onFileSelected" />
   </div>
 </template>
 
@@ -286,9 +237,7 @@ html, body {
   transition: background 0.15s;
 }
 
-.toolbar-actions button:hover {
-  background: rgba(255,255,255,0.14);
-}
+.toolbar-actions button:hover { background: rgba(255,255,255,0.14); }
 
 .toolbar-actions button.secondary {
   color: #8cf;
@@ -319,6 +268,14 @@ html, body {
   color: #ff9800;
 }
 
+.error-bar {
+  padding: 8px 16px;
+  background: #4a1a1a;
+  color: #f88;
+  font-size: 13px;
+  flex-shrink: 0;
+}
+
 .editor-main {
   flex: 1;
   display: flex;
@@ -328,4 +285,12 @@ html, body {
 .graph-area {
   flex: 1;
 }
+
+.loading-hint {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: #555;
+  font-size: 14px;
+}
 </style>
diff --git a/editor/components/SceneGraph.vue b/editor/components/SceneGraph.vue
index 3fc8957..a4f5232 100644
--- a/editor/components/SceneGraph.vue
+++ b/editor/components/SceneGraph.vue
@@ -1,12 +1,12 @@
 <script setup lang="ts">
-import { watch, onMounted, nextTick } from 'vue'
+import { watch, nextTick } from 'vue'
 import { VueFlow, useVueFlow } from '@vue-flow/core'
 import { Background } from '@vue-flow/background'
 import { Controls } from '@vue-flow/controls'
 import '@vue-flow/core/dist/style.css'
 import '@vue-flow/controls/dist/style.css'
 import '@vue-flow/core/dist/theme-default.css'
-import type { Node, Edge, Connection } from '@vue-flow/core'
+import type { Connection } from '@vue-flow/core'
 
 const props = defineProps<{
   sceneNodes: { id: string; label: string }[]
@@ -17,82 +17,82 @@ const props = defineProps<{
 
 const emit = defineEmits<{
   selectNode: [id: string]
-  addNode: []
   addEdge: [source: string, target: string]
 }>()
 
 const { nodes, edges, onNodeClick, onConnect, fitView } = useVueFlow()
 
-function buildNodes() {
+function makeNodes() {
   return props.sceneNodes.map((n, i) => ({
     id: n.id,
     type: 'default',
     position: { x: (i % 4) * 220 + 50, y: Math.floor(i / 4) * 120 + 50 },
-    data: { label: n.id === props.startScene ? `▶ ${n.label}` : n.label },
+    data: { label: n.id === props.startScene ? `\u25b6 ${n.label}` : n.label },
     style: n.id === props.startScene
-      ? 'background:#1b5e20; color:#fff; border-color:#388e3c'
+      ? { background: '#1b5e20', color: '#fff', borderColor: '#388e3c' }
       : n.id === props.selectedNodeId
-        ? 'background:#1565c0; color:#fff; border-color:#1976d2'
-        : '',
+        ? { background: '#1565c0', color: '#fff', borderColor: '#1976d2' }
+        : {},
     sourcePosition: 'right' as const,
     targetPosition: 'left' as const,
     connectable: true,
   }))
 }
 
-function buildEdges() {
+function makeEdges() {
   return props.sceneEdges.map((e) => ({
     id: e.id,
     source: e.source,
     target: e.target,
-    label: e.label || '',
+    label: e.label ?? '',
     animated: true,
-    style: { stroke: '#4fc3f7' },
-    labelStyle: { fill: '#aaa', fontWeight: 400, fontSize: 11 },
-    labelBgStyle: { fill: 'rgba(0,0,0,0.7)' },
   }))
 }
 
-let lastNodesLen = 0
-let lastEdgesLen = 0
+let prevNodeCount = -1
+let prevEdgeCount = -1
+let didFitView = false
+let rebuildSeq = 0
 
 async function structuralRebuild() {
+  const seq = ++rebuildSeq
   edges.value = []
   await nextTick()
-  nodes.value = buildNodes()
+  if (seq !== rebuildSeq) return
+  nodes.value = makeNodes()
   await nextTick()
-  edges.value = buildEdges()
-  lastNodesLen = props.sceneNodes.length
-  lastEdgesLen = props.sceneEdges.length
+  if (seq !== rebuildSeq) return
+  edges.value = makeEdges()
+  prevNodeCount = props.sceneNodes.length
+  prevEdgeCount = props.sceneEdges.length
+  if (!didFitView && nodes.value.length > 0) {
+    didFitView = true
+    setTimeout(() => fitView({ padding: 0.2 }), 80)
+  }
 }
 
-function styleOnlyRebuild() {
-  nodes.value = buildNodes()
-  edges.value = buildEdges()
+function inlineRebuild() {
+  nodes.value = makeNodes()
+  edges.value = makeEdges()
 }
 
-watch(() => [props.sceneNodes, props.sceneEdges, props.startScene, props.selectedNodeId], () => {
-  const nodesLen = props.sceneNodes.length
-  const edgesLen = props.sceneEdges.length
-  if (nodesLen !== lastNodesLen || edgesLen !== lastEdgesLen) {
-    structuralRebuild()
-  } else {
-    styleOnlyRebuild()
-  }
-})
+watch(
+  () => [props.sceneNodes, props.sceneEdges, props.startScene, props.selectedNodeId] as const,
+  () => {
+    const nc = props.sceneNodes.length
+    const ec = props.sceneEdges.length
+    if (nc !== prevNodeCount || ec !== prevEdgeCount) {
+      structuralRebuild()
+    } else {
+      inlineRebuild()
+    }
+  },
+)
 
-onNodeClick((event) => {
-  emit('selectNode', event.node.id)
-})
+onNodeClick((ev) => emit('selectNode', ev.node.id))
 
-onConnect((connection: Connection) => {
-  if (connection.source && connection.target) {
-    emit('addEdge', connection.source, connection.target)
-  }
-})
-
-onMounted(() => {
-  setTimeout(() => fitView({ padding: 0.2 }), 100)
+onConnect((conn: Connection) => {
+  if (conn.source && conn.target) emit('addEdge', conn.source, conn.target)
 })
 </script>
 
diff --git a/editor/composables/useGraphEditor.ts b/editor/composables/useGraphEditor.ts
index 967a4a6..aeec4a9 100644
--- a/editor/composables/useGraphEditor.ts
+++ b/editor/composables/useGraphEditor.ts
@@ -1,37 +1,58 @@
-import { ref, computed } from 'vue'
+import { ref, computed, shallowRef, triggerRef } from 'vue'
 import type { GameData, SceneNode, Choice } from '@engine/types'
 
-export interface EditorNode {
-  id: string
-  label: string
-  videoUrl: string
-  subtitleUrl: string
-  choices: Choice[]
-  nextScene: string
-  onEnter: any[]
-  qte: any | null
-}
-
 export function useGraphEditor() {
-  const gameData = ref<GameData>({ scenes: {}, startScene: '', variables: {} })
+  const gameData = shallowRef<GameData>({ scenes: {}, startScene: '', variables: {} })
   const selectedNodeId = ref<string | null>(null)
   const startSceneId = ref('')
 
-  const selectedNode = computed(() => {
+  const sceneList = computed(() =>
+    Object.values(gameData.value.scenes).map((s) => ({ id: s.id, label: s.id })),
+  )
+
+  const sceneNodes = computed(() =>
+    Object.values(gameData.value.scenes).map((s) => ({ id: s.id, label: s.id })),
+  )
+
+  const sceneEdges = computed(() => {
+    const result: { id: string; source: string; target: string; label?: string }[] = []
+    for (const [id, scene] of Object.entries(gameData.value.scenes)) {
+      if (scene.choices) {
+        let ci = 0
+        for (const c of scene.choices) {
+          if (c.targetScene) {
+            result.push({ id: `${id}_choice_${ci}`, source: id, target: c.targetScene, label: c.text.slice(0, 10) })
+          }
+          ci++
+        }
+      }
+      if (scene.nextScene) {
+        result.push({ id: `${id}_next`, source: id, target: scene.nextScene, label: '\u2192 \u9ed8\u8ba4' })
+      }
+      if (scene.qte) {
+        if (scene.qte.successScene)
+          result.push({ id: `${id}_qte_s`, source: id, target: scene.qte.successScene, label: 'QTE\u6210\u529f' })
+        if (scene.qte.failScene)
+          result.push({ id: `${id}_qte_f`, source: id, target: scene.qte.failScene, label: 'QTE\u5931\u8d25' })
+      }
+    }
+    return result
+  })
+
+  const selectedScene = computed(() => {
     if (!selectedNodeId.value) return null
     return gameData.value.scenes[selectedNodeId.value] ?? null
   })
 
-  const sceneList = computed(() => {
-    return Object.values(gameData.value.scenes).map((s) => ({
-      id: s.id,
-      label: s.id,
-    }))
-  })
+  function trigger() {
+    triggerRef(gameData)
+  }
 
   function loadJSON(json: GameData) {
     gameData.value = JSON.parse(JSON.stringify(json))
-    startSceneId.value = json.startScene
+    trigger()
+    startSceneId.value = json.startScene || ''
+    selectedNodeId.value = null
   }
 
   function exportJSON(): GameData {
@@ -46,76 +67,112 @@ export function useGraphEditor() {
 
   function addScene(): string {
     const id = generateId()
-    gameData.value.scenes[id] = {
-      id,
-      videoUrl: '',
-      choices: [],
-      nextScene: '',
-      subtitleUrl: '',
-      onEnter: [],
+    gameData.value = {
+      ...gameData.value,
+      scenes: {
+        ...gameData.value.scenes,
+        [id]: {
+          id,
+          videoUrl: '',
+          choices: [],
+          nextScene: '',
+          subtitleUrl: '',
+          onEnter: [],
+        },
+      },
     }
+    trigger()
     return id
   }
 
   function deleteScene(id: string) {
     if (startSceneId.value === id) return
-    delete gameData.value.scenes[id]
-    for (const s of Object.values(gameData.value.scenes)) {
-      s.choices = (s.choices || []).filter((c) => c.targetScene !== id)
-      if (s.nextScene === id) s.nextScene = ''
+    const nextScenes = { ...gameData.value.scenes }
+    delete nextScenes[id]
+    for (const key of Object.keys(nextScenes)) {
+      const s = nextScenes[key]
+      if (s.choices)
+        nextScenes[key] = { ...s, choices: s.choices.filter((c) => c.targetScene !== id) }
+      if (s.nextScene === id) nextScenes[key] = { ...nextScenes[key], nextScene: '' }
+      if (s.qte) {
+        const qte = { ...s.qte }
+        let changed = false
+        if (qte.successScene === id) { qte.successScene = ''; changed = true }
+        if (qte.failScene === id) { qte.failScene = ''; changed = true }
+        if (changed) nextScenes[key] = { ...nextScenes[key], qte }
+      }
     }
+    gameData.value = { ...gameData.value, scenes: nextScenes }
+    trigger()
     if (selectedNodeId.value === id) selectedNodeId.value = null
   }
 
-  function updateScene(id: string, partial: Partial<EditorNode>) {
+  function updateScene(id: string, partial: Partial<SceneNode>) {
     const scene = gameData.value.scenes[id]
     if (!scene) return
-    Object.assign(scene, partial)
-    gameData.value.scenes = { ...gameData.value.scenes }
+    gameData.value = {
+      ...gameData.value,
+      scenes: { ...gameData.value.scenes, [id]: { ...scene, ...partial } },
+    }
+    trigger()
   }
 
   function addChoice(sourceId: string) {
     const scene = gameData.value.scenes[sourceId]
     if (!scene) return
-    if (!scene.choices) scene.choices = []
-    scene.choices.push({
-      text: '新选项',
-      targetScene: '',
-    })
-    gameData.value.scenes = { ...gameData.value.scenes }
+    gameData.value = {
+      ...gameData.value,
+      scenes: {
+        ...gameData.value.scenes,
+        [sourceId]: {
+          ...scene,
+          choices: [...(scene.choices || []), { text: '\u65b0\u9009\u9879', targetScene: '' }],
+        },
+      },
+    }
+    trigger()
   }
 
   function updateChoice(sourceId: string, index: number, partial: Partial<Choice>) {
     const scene = gameData.value.scenes[sourceId]
     if (!scene?.choices) return
-    Object.assign(scene.choices[index], partial)
-    gameData.value.scenes = { ...gameData.value.scenes }
+    const newChoices = scene.choices.map((c, i) => (i === index ? { ...c, ...partial } : c))
+    gameData.value = {
+      ...gameData.value,
+      scenes: { ...gameData.value.scenes, [sourceId]: { ...scene, choices: newChoices } },
+    }
+    trigger()
   }
 
   function deleteChoice(sourceId: string, index: number) {
     const scene = gameData.value.scenes[sourceId]
     if (!scene?.choices) return
-    scene.choices.splice(index, 1)
-    gameData.value.scenes = { ...gameData.value.scenes }
-  }
-
-  function newSceneData(): EditorNode {
-    return {
-      id: '',
-      label: '',
-      videoUrl: '',
-      subtitleUrl: '',
-      choices: [],
-      nextScene: '',
-      onEnter: [],
-      qte: null,
+    gameData.value = {
+      ...gameData.value,
+      scenes: {
+        ...gameData.value.scenes,
+        [sourceId]: { ...scene, choices: scene.choices.filter((_, i) => i !== index) },
+      },
     }
+    trigger()
   }
 
   return {
-    gameData, selectedNodeId, selectedNode, sceneList, startSceneId,
-    loadJSON, exportJSON, addScene, deleteScene, updateScene,
-    addChoice, updateChoice, deleteChoice,
-    newSceneData, generateId,
+    gameData,
+    selectedNodeId,
+    selectedScene,
+    sceneList,
+    sceneNodes,
+    sceneEdges,
+    startSceneId,
+    loadJSON,
+    exportJSON,
+    addScene,
+    deleteScene,
+    updateScene,
+    addChoice,
+    updateChoice,
+    deleteChoice,
+    generateId,
   }
 }