Abstract:An earthquake with MS4.6 occurred at 17:08,May 22,2016 in Chaoyang,Liaoning. We used the P-wave first motion method,TDMT method,and CAP method to determine the focal mechanisms and the PTD method and sPn-Pn method to determine the focal depth. The focal mechanism results of the three methods are consistent. The depth results of the CAP method,PTD method and sPn-Pn method are close. We used the double difference location method to relocate earthquakes in 2009-2016,and obtained the strikes and dip angles of the small earthquake distributions with the help of simulated annealing algorithm and gauss Newton algorithm fitting. According to the focal mechanism results,the depth results,the characteristics of small earthquake distributions and the structural characteristics of the source area,the seismogenic fault strike is NEE and the main pressure force direction is NNW. The earthquake focal mechanism is for normal fault type with a little left-lateral strike slip motion.