diff --git a/simple-mind-map/example/exampleData.js b/simple-mind-map/example/exampleData.js
index 693e0630..ab5e6ed4 100644
--- a/simple-mind-map/example/exampleData.js
+++ b/simple-mind-map/example/exampleData.js
@@ -860,8 +860,8 @@ export default {
             // 自定义配置...
         }
     },
-    // "layout": "logicalStructure",
+    "layout": "logicalStructure",
     // "layout": "mindMap",
     // "layout": "catalogOrganization"
-    "layout": "organizationStructure"
+    // "layout": "organizationStructure"
 }
\ No newline at end of file
diff --git a/simple-mind-map/src/layouts/Base.js b/simple-mind-map/src/layouts/Base.js
index e7f13b45..7c4d7043 100644
--- a/simple-mind-map/src/layouts/Base.js
+++ b/simple-mind-map/src/layouts/Base.js
@@ -87,6 +87,16 @@ class Base {
         return newNode;
     }
 
+    /** 
+     * @Author: 王林 
+     * @Date: 2021-07-16 13:48:43 
+     * @Desc: 定位节点到画布中间 
+     */
+    setNodeCenter(node) {
+        node.left = (this.mindMap.width - node.width) / 2
+        node.top = (this.mindMap.height - node.height) / 2
+    }
+
     /** 
      * javascript comment 
      * @Author: 王林25 
diff --git a/simple-mind-map/src/layouts/CatalogOrganization.js b/simple-mind-map/src/layouts/CatalogOrganization.js
index 5fbdb1eb..66d15967 100644
--- a/simple-mind-map/src/layouts/CatalogOrganization.js
+++ b/simple-mind-map/src/layouts/CatalogOrganization.js
@@ -49,8 +49,7 @@ class CatalogOrganization extends Base {
             let newNode = this.createNode(cur, parent, isRoot, layerIndex)
             // 根节点定位在画布中心位置
             if (isRoot) {
-                newNode.left = (this.mindMap.width - newNode.width) / 2
-                newNode.top = (this.mindMap.height - newNode.height) / 2
+                this.setNodeCenter(newNode)
             } else {
                 // 非根节点
                 if (parent._node.isRoot) {
diff --git a/simple-mind-map/src/layouts/LogicalStructure.js b/simple-mind-map/src/layouts/LogicalStructure.js
index a469019f..3a81fa0b 100644
--- a/simple-mind-map/src/layouts/LogicalStructure.js
+++ b/simple-mind-map/src/layouts/LogicalStructure.js
@@ -49,8 +49,7 @@ class LogicalStructure extends Base {
             let newNode = this.createNode(cur, parent, isRoot, layerIndex)
             // 根节点定位在画布中心位置
             if (isRoot) {
-                newNode.left = (this.mindMap.width - newNode.width) / 2
-                newNode.top = (this.mindMap.height - newNode.height) / 2
+                this.setNodeCenter(newNode)
             } else {
                 // 非根节点
                 // 定位到父节点右侧
diff --git a/simple-mind-map/src/layouts/MindMap.js b/simple-mind-map/src/layouts/MindMap.js
index 5dfcf4f7..a51c10e6 100644
--- a/simple-mind-map/src/layouts/MindMap.js
+++ b/simple-mind-map/src/layouts/MindMap.js
@@ -50,8 +50,7 @@ class MindMap extends Base {
             let newNode = this.createNode(cur, parent, isRoot, layerIndex)
             // 根节点定位在画布中心位置
             if (isRoot) {
-                newNode.left = (this.mindMap.width - newNode.width) / 2
-                newNode.top = (this.mindMap.height - newNode.height) / 2
+                this.setNodeCenter(newNode)
             } else {
                 // 非根节点
                 // 三级及以下节点以上级为准
diff --git a/simple-mind-map/src/layouts/OrganizationStructure.js b/simple-mind-map/src/layouts/OrganizationStructure.js
index 02cd7e0a..04b2c7b5 100644
--- a/simple-mind-map/src/layouts/OrganizationStructure.js
+++ b/simple-mind-map/src/layouts/OrganizationStructure.js
@@ -50,8 +50,7 @@ class OrganizationStructure extends Base {
             let newNode = this.createNode(cur, parent, isRoot, layerIndex)
             // 根节点定位在画布中心位置
             if (isRoot) {
-                newNode.left = (this.mindMap.width - newNode.width) / 2
-                newNode.top = (this.mindMap.height - newNode.height) / 2
+                this.setNodeCenter(newNode)
             } else {
                 // 非根节点
                 // 定位到父节点下方