In this paper, Facade design pattern is first introduced for the development of applications based on J2EE, and the remote call under the J2EE architecture is analyzed. The implementation of EDT ( encapsulated data type) is described. 基于J2EE的应用程序开发所使用的Facade设计模式,进行J2EE中远程调用的分析,实现EDT(封装数据类型);