diff --git a/src/treestore.js b/src/treestore.js
index 320bdfb..22807fd 100644
--- a/src/treestore.js
+++ b/src/treestore.js
@@ -572,7 +572,10 @@
       }
       params = {id : node.id};
       if(pidField){
-        params[pidField] = node.id;
+        //params[pidField] = node.id;
+        //pid应该是node.parent.id而不是node.id
+        params[pidField] = node.parent ? node.parent.id : 
+            node.pid != null ? node.pid : node.id || 0;
       }
       _self.load(params);  
     },