On the basis of earthquake phases recorded by the Yunnan Digital Seismic Network and the Tengchong volcano broadband seismic instruments in January ~ December,2011 and the location results by Hypo2000 absolute location methods as the initial value,we obtained the locations of the foreshocks and aftershocks of MsS.8 Yingjiang sequence with double-difference location method.Our results show that the relocated aftershocks have a conjugate characteristic:earthquakes dominantly occurred along the Dayingjiang fault in.ENE direction and another extended toward the SSE along a blind fault which was vertical to the Dayingjiang fault.The seismicity gap of aftershocks happens to be the foreshocks intensive areas.