Abstract: The characteristics of near-fault ground motion velocity pulse are analyzed based on the pulse identification method of fourth-order continuous wavelet transform. The low-frequency velocity pulse components such as directional effect pulse are included by the factory-stacking method, and the randomness of fault distance, fault type, seismic moment, source depth, quality factor Q and high-frequency attenuation factor kappa are considered. Based on the dynamic corner frequency random finite fault method, a complete near-field pulse ground motion simulation model is established by integrating the low-frequency velocity pulse characteristics of near-fault ground motion. The Jiji earthquake (Mw7.6) on September 21, 1999 was taken as an example to verify the correctness of the proposed method. Then, the simulated near-fault ground motion and the measured ground motion records are input into the finite element model of RC beam bridge respectively to analyze the structural dynamic response, and the applicability of this method in structural seismic response analysis is verified. The results show that the improved near-field pulse ground motion simulation results on the basis of dynamic corner frequency random finite fault method match well with the measured records, and can effectively reflect the failure characteristics of RC beam Bridges under near-fault earthquake action, and can be used as a reference for seismic design of Bridges near fault.