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The resource sharing and collaboration based on Internet requires that agents can coordinate with each other in a trustable and effective manner. However non-autonomous character of web services cumbered the automatic collaboration of web services. In the case, there is an urgent need for web services to construct a uniform and shared specification or contract for coordinating with each other. In this paper, we proposed an approach to automatically generating web services contract. This approach is based on the web service classification, service discovery and service description template. The service contract can be generated in an automatic and effective manner. At last, we give the system architecture design and implementation for web services collaboration.