In order to integrate the different application programs, the Enterprise Service Bus need parse the request service and the corresponding analytical protocol. The Protocol converter realized that the agreement of an application program is mapped to the agreement of the application, and the two application programs will not know the need and the action of such mapping. the paper puts forward that the ESB are going to shift the data into the data in a unified XML format, and manipulate the data based on a parallel approach to parsing of XML, so as to realize the transparency of the transmission protocol.