| With the rapid development of computer and communication technology, globalization is becoming a reality. In order to keep up with the changing market corporations must take the market planning manufacturing and enterprise management into account. Enterprise information system contains multi platforms and multi systems. Enterprise solutions must have the ability to support different platforms and different data formats and different kind of connections. With the increasing of different computing environments, the interoperating between different systems becoming more and more important.LonWorks was invented by Echelon in 1991. It has the advantage of unity, open and interoperation. Web Service is the hot point of IT field. The aim of Web Service is to supply a general solution independent from platform and programming language. Under this solution different platforms and systems can communicate with each other. Based on the enterprise information integration requirement, this paper import Web Service into Field Bus area to supplies a cheap, easy to implement and based on the general protocol method.The first chapter discusses the challenges that enterprise information system encounters, overview of LonWorks technology, overview of Web Service technology, and this paper's purposes contain and sense. The second chapter is about the neuron chip, transceiver, LonTalk protocol, and LNS. LonMark standards are also discussed. Finally, LonWorks system design is argued. The third chapter talks over Web Service technology including Web Service conceptual architecture, The SOAP, WSDL, UDDI core standards, the application model of Web Service. The forth chapter is about the implementation of information system integration including extraction of field information, information integration architecture, and the advantage of integration based on Web Service technology, finally a sample is provided, this sample is a C++ program integrate the i.LON 100 Internet server' s Web Service function.
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