The M_S5.8 earthquake swarm occurred in Qian Gorlos Autonomous County,Jilin Province on October 31,2013. The earthquake is a rare swarm type in Song-Liao Basin. It's located on the intersection of Songyuan-Zhaodong fracture along NE direction and Chaganpao-Daozijing fracture along NW direction. Considering the seismogenic structure of this earthquake swarm is not clear,we relocated the hypocenters of 692 aftershocks based on double-difference earthquake location algorithm,and concluded that moderate aftershocks with M ≥ 3.0 have no opt-direction in space,while only small aftershocks have a NW opt-direction. We calculated,based on Coulomb Failure stress changes theory,the accumulated ΔCFS opt-solution of 4 M5.0 earthquakes both on NW focal plane and NE focal plane,and discussed the seismogenic structure by the analysis of spatial correlation between the pattern of ΔCFS opt-solution and relocated aftershocks. Our results show that ΔCFS opt-solution of the NW focal plane are positive on mainshock fracture,but opposite for the NE focal plane. And most ΔCFS values of NW focal plane on fracture reach the trigger threshold(0.01~0.10MPa),which controls the spatial pattern of most aftershocks. It is therefore concluded that Chaganpao-Daozijing fracture on NW direction plays a more important role in the evolution of Qian Gorlos earthquake swarm.