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Clustering is the hot spot in the study of data mining. This paper proposed a cluster reducing strategy based on so called "vibrating method". The "vibrating method" synthesizes the merits of the "distance based method" and the "density based method" of traditional clustering algorithm. It first finds out the "core" of each cluster and then "vibrating" cores to lower the difference between the clusters and tight the relationship among the clusters. Therefore, it can be used as a cluster reducing strategy to reduce or compose the clusters after clustering.