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The greatest advantage of the P2P network is the robustness which provides an opportunity to create a decentralized environment for web service publication and discovery. A new study shows that the roaming and fleeting communication between immune cells form an information-sharing network. By analogy, we design a web service discovery mechanism on unstructured P2P network. Firstly, all the web services are clustered into communities through functional properties. Then, several query packets wander among these communities to make rapid recognition and exchange their experience at their encounter. And then, the query packet will be proliferated and spread through the most matched community. Each service in this community will be evaluated through non-functional properties. Eventually, the best service for our integration in the future step is elected out. The service clustering and experience exchanging enhanced the efficiency in discovery.