diff --git a/src/model/WorldModelType.ts b/src/model/WorldModelType.ts
index 77cf2a8..ac14f25 100644
--- a/src/model/WorldModelType.ts
+++ b/src/model/WorldModelType.ts
@@ -130,11 +130,6 @@ export interface ItemJson {
    */
   dt: {
     /**
-     * 测量线段关联的点对象(uuid), 仅在 a='ln' 时有效
-     */
-    link?: string[]
-
-    /**
      * 物流关联对象(uuid)
      */
     center?: string[]
diff --git a/src/model/example1.js b/src/model/example1.js
index 9273172..16b22a2 100644
--- a/src/model/example1.js
+++ b/src/model/example1.js
@@ -48,8 +48,7 @@ export default {
                 [0.25, 0.1, 0.25] // 缩放向量 scale
               ],
               dt: {          // 用户数据, 可自定义, 一般用在 three.js 的 userData 中
-                link: ['p2'],   // 用于 a='ln' 的测量线段, 关联的点对象(uuid)
-                center: [],     // 物流关联对象(uuid)
+                center: ['p2'],   // 用于 a='ln' 的测量线段, 关联的点对象(uuid)
                 in: [],         // 物流入方向关联的对象(uuid)
                 out: []         // 物流出方向关联的对象(uuid)
               }
@@ -59,7 +58,7 @@ export default {
               t: 'measure', a: 'ln', l: '测量2', c: '#ff0000',
               tf: [[-9.0, 0, 3], [0, 0, 0], [0.25, 0.1, 0.25]],
               dt: {
-                link: ['p3', 'p4']
+                center: ['p3', 'p4']
               }
             },
             {
@@ -67,7 +66,7 @@ export default {
               t: 'measure', a: 'ln', l: '测量3', c: '#ff0000',
               tf: [[-5.0, 0, 3], [0, 0, 0], [0.25, 0.1, 0.25]],
               dt: {
-                link: []
+                center: []
               }
             },
             {
@@ -75,7 +74,7 @@ export default {
               t: 'measure', a: 'ln', l: '测量3', c: '#ff0000',
               tf: [[-9.0, 0, 8], [0, 0, 0], [0.25, 0.1, 0.25]],
               dt: {
-                link: []
+                center: []
               }
             }
           ]
diff --git a/src/model/itemType/ItemTypeLine.ts b/src/model/itemType/ItemTypeLine.ts
index 62629a6..5a88ec8 100644
--- a/src/model/itemType/ItemTypeLine.ts
+++ b/src/model/itemType/ItemTypeLine.ts
@@ -73,7 +73,7 @@ export default abstract class ItemTypeLine extends ItemType {
   }
 
   /**
-   * 所有点数据加载完成后，添加进场景之后，需要根据 link 数组创建连接线
+   * 所有点数据加载完成后，添加进场景之后，需要根据 center 数组创建连接线
    */
   afterAddScene(viewport: Viewport, scene: THREE.Scene, objects: THREE.Object3D[]) {
     super.afterAddScene(viewport, scene, objects)
@@ -82,8 +82,8 @@ export default abstract class ItemTypeLine extends ItemType {
     for (let i = 0; i < this.pointArray.length; i++) {
       const startPoint = this.pointArray[i]
 
-      // 找到这个元素的 userData.link 数组
-      const linkArray: string[] = startPoint.userData.link || []
+      // 找到这个元素的 userData.center 数组
+      const linkArray: string[] = startPoint.userData.center || []
 
       for (let j = 0; j < linkArray.length; j++) {
         const linkId = linkArray[j]
@@ -179,7 +179,7 @@ export default abstract class ItemTypeLine extends ItemType {
       }
 
       // 无论 a->b 还是 b->a 都需要收集
-      if (_.includes(targetObj.userData?.link, point.uuid) || _.includes(point.userData?.link, targetObj.uuid)) {
+      if (_.includes(targetObj.userData?.center, point.uuid) || _.includes(point.userData?.center, targetObj.uuid)) {
         relationPoints.add(targetObj)
       }
     })
@@ -208,7 +208,7 @@ export default abstract class ItemTypeLine extends ItemType {
       // 判断谁是起点，谁是终点
       let startPoint: THREE.Object3D
       let endPoint: THREE.Object3D
-      if (_.includes(targetPoint.userData?.link, this.dragPoint.uuid)) {
+      if (_.includes(targetPoint.userData?.center, this.dragPoint.uuid)) {
         startPoint = targetPoint
         endPoint = this.dragPoint
 
diff --git a/src/model/itemType/Toolbox.ts b/src/model/itemType/Toolbox.ts
index 96d217f..7b67120 100644
--- a/src/model/itemType/Toolbox.ts
+++ b/src/model/itemType/Toolbox.ts
@@ -257,7 +257,9 @@ export default abstract class Toolbox {
         [defaultScale.x, defaultScale.y, defaultScale.z]
       ],
       dt: {
-        link: [] as string[]
+        in: [] as string[],
+        out: [] as string[],
+        center: [] as string[]
       }
     } as ItemJson
     const marker = this.itemType.createPoint(point, itemJson)
diff --git a/src/model/itemType/ToolboxLine.ts b/src/model/itemType/ToolboxLine.ts
index 818889b..74e00ff 100644
--- a/src/model/itemType/ToolboxLine.ts
+++ b/src/model/itemType/ToolboxLine.ts
@@ -31,7 +31,7 @@ export default class ToolboxLine extends Toolbox {
 
   afterAddPoint(startPoint: THREE.Object3D, point: THREE.Object3D) {
     // 如果起始点存在，则将新点添加到起始点的链接中
-    startPoint.userData.link.push(point.uuid)
+    startPoint.userData.center.push(point.uuid)
     this.itemType.createLine(this.viewport, this.viewport.scene, this.startPoint, point)
   }