Abstract：Using seismic data of Chongqing area from January 2009 to October 2018 recorded by the Chongqing digital seismic network directory, we use the double-difference tomography method to obtain the three-dimensional velocity structure model of the upper crust in Chongqing. The results show a high correlation between the shallow crustal velocity structure and the distribution of geological structures. The fold base of the Shizhu area is missing, and the velocity structure on both sides of the fault is quite different. The difference in velocity structure between the two sides of the Huayingshan basement fault may be related to the depth and physical properties of the crystalline basement on both sides. The high-speed area of the Wuxi fault may be related to the material overflow in the deep mantle, affecting the stress distribution and seismic activity in the earth’s crust.