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The correlation between topology and search algorithm is less paid attention to in unstructured P2P network. In this paper, we focus on designing better search algorithm to adapt to the current network rather than to design the universal algorithm to adapt to a variety of network. Analyzing the characteristics that the flooding algorithm showing in different search stages in different network, we put forward the segment search algorithm. Through experiments we find that it has good results. In addition, we design our algorithm to be simple, as a module that can be easily applied to existing unstructured P2P systems for immediate impact.