Through analyzing the field fracturing data of WeiH3-1 well,we obtained the spatial positions and focal mechanisms of 1507 events simultaneously by using the joint inversion algorithm(Joint Source Scanning Algorithm,JSSA). Based on the focal mechanisms of joint inversion,the P axes of events can be calculated,and the stress distribution state of the work area can be explained. Through the comprehensive interpretation and analysis of the work area,we find that there is a large-scale natural fracture with north-south trend in the west of the work area,and some small-scale fracturing fractures near the horizontal well,so as to evaluate the fracturing effect and guide the fracturing operation.