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In this paper, we relocated the Minle-Shadan M6.1 earthquake sequence, including 81 aftershocks of ML>2.5, with earthquake Pg phase data on 6 stations. Using the simplex algorithm of earthquake location, we got basic parameters of them. The result of relocation shows that the fitness between the distribution of aftershocks and the seismic intensity map. Based on this result, the causative structure of main shock and the earthquake sequence are discussed. We think the causative structure of main earthquake is Tongziba river buried fault. Other buried fault (Yongchang-Minle buried fault) involves the action of after earthquakes.