diff --git a/ui/src/workflow/common/app-node.ts b/ui/src/workflow/common/app-node.ts
index fcfac040e..a46b7ee2a 100644
--- a/ui/src/workflow/common/app-node.ts
+++ b/ui/src/workflow/common/app-node.ts
@@ -110,12 +110,20 @@ class AppNodeModel extends HtmlResize.model {
   }
   setAttributes() {
     this.width = this.properties?.width || 340
+
     const circleOnlyAsTarget = {
       message: '只允许从右边的锚点连出',
       validate: (sourceNode: any, targetNode: any, sourceAnchor: any) => {
         return sourceAnchor.type === 'right'
       }
     }
+
+    this.sourceRules.push({
+      message: '只允许连一个节点',
+      validate: (sourceNode: any, targetNode: any, sourceAnchor: any) => {
+        return !this.graphModel.edges.some((item) => item.sourceNodeId === sourceNode.id)
+      }
+    })
     this.sourceRules.push(circleOnlyAsTarget)
     this.targetRules.push({
       message: '只允许连接左边的锚点',