diff --git a/Action.js b/Action.js
index 9abdb08..1f5063c 100644
--- a/Action.js
+++ b/Action.js
@@ -122,8 +122,14 @@ DAD.execute = async function (action) {  // For chain server.
 DAD._initTypeDict = function(typedActionDict) {
   Object.assign(wo, typedActionDict)
 }
+DAD.getTypedAction = function(type){
+  return wo[type]
+}
+DAD.createTypedAction = function(action){
+  return new wo[action.type](action)
+}
 
-DAD.build = async function (action, keypair) { // Applicable on client. 客户端调用 Action.build，即可新建、并打包成一个完整的子事务，不需要亲自调用 constructor, packMe 等方法。 
+DAD.buildUserAction = async function (action, keypair) { // Applicable on client. 客户端调用 Action.build，即可新建、并打包成一个完整的子事务，不需要亲自调用 constructor, packMe 等方法。 
   if (action && action.type && keypair && keypair.seckey && keypair.pubkey && ticCrypto.seckey2pubkey(keypair.seckey)===keypair.pubkey) {
     let typedAction = new wo[action.type](action)
     typedAction.actorPubkey = keypair.pubkey
@@ -182,7 +188,7 @@ DAD.api.prepare = async function (option) {
       DAD.actionPool[option.Action.hash] = typedAction
       DAD.actionPoolInfo.totalAmount += option.Action.amount || 0
       DAD.actionPoolInfo.totalFee += option.Action.fee || 0
-      wo.Netnode.broadcast({ Action: option.Action })
+//      wo.Netnode.broadcast({ Action: option.Action }) // 即使对 master 分支的node.server 也报错：Cannot read property 'broadcast' of undefined 
       return option.Action
     }
   }