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In view of today's unprecedented diverse and discrete mass text data processing, this paper presents a distributed MST (minimum spanning tree) algorithm based on MapReduce programming model. And with this MST algorithm, a distributed MST text clustering algorithm is designed and implemented. In this paper, this clustering algorithm is analyzed in three aspects: text feature vector extraction, graph construction and MST construction. And some data was used to experimentally compare this algorithm with ordinary MST clustering algorithm and MapReduce-based K-means clustering algorithm.