Abstract: People need more and more information resource as the development of networks technology. Users not only satisfy the search based on key works. They wish that the network can take the information that users concerned as cen- ter, and oriented to the need, then collecting all the related information. hhis is the concept of semantic association focu- sing services. In order to realize the above require, we propose to build a semantic overlay networks contains semantic association. At first, we organize the nodes to clustering, and compute the semantic association value, then add associa- tion links between the clusters.

Key words: Pecr-to-pecr network, Semantic association, Focusing services, Clustering, Semantic overlay networks