The 1209 earthquakes occurred in Xianyou，Fujian from August 4，2010 to October 4，2013． The largest earthquakes is ML5. 0 on September 4，2013． To strengthen the research of Xianyou earthquake sequence and understand the causative structure and stress field of Xianyou， the focal mechanism solutions of six earthquakes (ML ＞ 3. 5) in Xianyou are calculated using the broadband digital data of Fujian Earthquake Network and the seismic moment tensor inverse method． The results show that the focal faults of the 6 earthquakes are similar． They are all strike slip faults with the fault strike to the northwest and high dip angle． The principal compressive stress axes are near to SN，which are different of the stress field of Fujian region． The Xianyou earthquake sequence may be induced by the stress adjustment after the impoundment of Jinzhong reservoir．