diff --git a/src/api/plmModel.ts b/src/api/plmModel.ts
index 3116b21..27e0461 100644
--- a/src/api/plmModel.ts
+++ b/src/api/plmModel.ts
@@ -45,7 +45,7 @@ export const plmModelApi = {
       url: '/biz/plm/model/preview',
       method: 'get',
       params,
-      timeout: 120000,
+      timeout: 360000,
     })
   },
 }
diff --git a/src/components/CadModelViewer.vue b/src/components/CadModelViewer.vue
index 652c579..fd07a78 100644
--- a/src/components/CadModelViewer.vue
+++ b/src/components/CadModelViewer.vue
@@ -46,8 +46,10 @@ let animationId = null
 let currentModel = null
 let dracoLoader
 let gltfLoader
-let defaultCameraPosition = new THREE.Vector3(0,0,9)
-let defaultTarget = new THREE.Vector3(0,0,0)
+let resetCameraPos = new THREE.Vector3()
+let resetLookTarget = new THREE.Vector3()
+let grid = new THREE.GridHelper(200,20,0x666666,0xdcdcdc)
+
 
 
 function resolveUrl(modelUrl) {
@@ -100,10 +102,7 @@ const initScene = () => {
   const fillLight = new THREE.DirectionalLight(0xffffff, 0.35)
   fillLight.position.set(-200, -100, -200)
   scene.add(fillLight)
-
-  const grid = new THREE.GridHelper(10, 20, 0xcccccc, 0xe8e8e8)
-  scene.add(grid)
-
+  // scene.add(grid)
 
   controls = new OrbitControls(camera, renderer.domElement)
   controls.enableDamping = true
@@ -149,6 +148,16 @@ const fitModelToView = (model) => {
   camera.updateProjectionMatrix()
   controls.target.set(0, 0, 0)
   controls.update()
+
+  // 网格尺寸取模型最大尺寸的 2.5 倍，保证四周留白
+  const gridSize = Math.ceil(maxDim * 2.5)
+  // 分段数按尺寸自适应，保证每格宽度合理
+  const gridDivisions = Math.max(10, Math.floor(gridSize / 10))
+  grid = new THREE.GridHelper(gridSize, gridDivisions, 0x666666, 0xdcdcdc)
+  scene.add(grid)
+
+  resetCameraPos.copy(camera.position)
+  resetLookTarget.copy(controls.target)
 }
 
 const loadModel = () => {
@@ -225,8 +234,9 @@ const onWindowResize = () => {
 
 function resetView() {
   if (!camera || !controls) return
-  camera.position.copy(defaultCameraPosition)
-  controls.target.copy(defaultTarget)
+  camera.position.copy(resetCameraPos)
+  controls.target.copy(resetLookTarget)
+  camera.updateProjectionMatrix()
   controls.update()
 }