【正文】 nd platform independent. Major software panies supply various kinks of platforms and frameworks to develop Web Services, and also there are a lot of applications about Web Services on the Inter. The data format of Web Services is XML. The description of XML document format is XML Schema. SOAP describes the rules and format of munication. WSDL describes the interfaces and the methods of processing messages between Web Services and the client, and puters can discovery more Web Services on the Inter by using UDDI. The market scale of housing online trading has developed to some extent. Housing online trading has occupied the advantages such as long time online, dynamic interaction, diversiform exhibition, broad impact and timely information update, which has a powerful impact on traditional store trading. Web Services will be used in online housing trading and it can improve the accuracy and reusability of the information, simplify the development process of the trading platform, and increase the flexibility and professionalism of Housing Online Trading Platform. In order to implement Housing Online Trading Platform, first, analyze mon format of housing and estate information, construct XML Schema which describes XML of housing and the property information. With a series of interfaces provided by Web Services which includes enquiry, submission, modification, deletion and other operations, XML of housing and the property information can be used by any application on the Inter through SOAP. With the requirement analysis and web modeling of Housing Online Trading Platform, making use of IIS as Web server, as development technology, and HTML/CSS/JavaScript as development language, Housing Online Trading Platform is implemented. Key words： Web Services， XML， WSDL， UDDI， House Online Trading Platform evaluat ion of scient if ic developm ent . Nat ur e securit y t ype nat ur e securit y is t o m aint enance people of healt h value f or t ar get , t hr ough st r engt hening securit y based m anagem ent , and r isk m anagem ent , and equipm ent m anagem ent and t echnol g y super vision, ensure pr oduct ion in t he people, and r eal, and syst em , and syst em, elem ent s secur it y r eliable, and har m ony unif ied, f ul cont r ol var ious against f act ors, achieved t hought no slack, and m anagem ent no em pt y docum ent, and equipm ent no hidden, and syst em no blocked, and unit zer o nonst opped. 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