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Wireless sensor networks(WSNs), which is utilized in a broad region, is able to monitor and collect various information of different objects location plays a critical role in WSNs. Currently, many localization algorithms are proposed such as the classical MDS localization algorithm. It has a low accuracy in large scale of sensor network with a lot of nodes. For this defect, this paper proposes a improvement algorithm based on fuzzy-c means. The results of simulation show that the improvement algorithm has a higher accuracy than the classical MDS localization algorithm in large scale of sensor network.