Abstract:In order to determine the future seismic risk of Yinchuan area, we undertake a comprehensive study of the main faults and tectonic evolution, GPS velocity field, modern seismic activity and hypocenter depth profile of the Yinchuan basin. The results show that the power of the Yinchuan basin is mainly due to the influence of the NW subduction of the Pacific plate and the NE compression of the Qinghai-Tibet plateau, and that the basin is in the environment ofshearing and pulling. The GPS velocity field shows that the velocity in the south of the Yinchuan basin is larger than that in the north. Horizontal tensile deformation and shear deformation during the period of 2009-2015 are reduced compared with that in 1999-2007, but the rate is increasing. According to modern seismic data and hypocenter depth profile, the distribution of the earthquake is mainly near the fault and the focal depth of the earthquake is controlled by the faults, indicating that the fault has a good control of the earthquake. Furthermore, the GPS parallel velocity and small seismicity in the basin have good correlation with the fault activity. The GPS parallel velocity is high, the activity of the small earthquake is intensive and the activity of the fault is strong.