Abstract: Conventional data exchange systems lack reusability and extensibility.In this paper,a software frame which is universal and easy to extend and maintain is set up by building a operation flow criterion conforming to XML standard.Furthermore,in order to fit the disunity actuality of data exchange standard and improve the data exchange system reusability and extensibility,object-oriented technology and component technology are adopted.Consequently,an A2A electronic data exchange system based on XML is designed and implemented.