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Comparing with traditional Web techniques, Web Service is a loose coupling to efficiently integrate the information cross-enterprise, cross-platform, and cross-language. It's also standards-based and platform neutral .These features make the Web Service technology ideal for system integration at the enterprise level, and for supporting Business-to-business integration and application-to-application electronic commerce (e-commerce) in the large distributed Internet and Intranet environment. E-commerce relies on information exchange between trading partners over networks, often the Internet. Therefore, there are always security risks since messages could be stolen, lost, or modified. It is thus crucial to manage Web Services security effectually and unfailingly. In this paper, the security requirements and technologies of web services for E-commerce are to be presented.