The Kunlun Mountain Pass earthquake in 2001 experienced a complicated rupture process with long rupture length, large amplitude and variable velocity, which has become a model case of continental earthquake study. Based on the near-field high-resolution geodetic data(4 InSAR image, 34 GPS points coseismic displacement) and high signal to noise ratio teleseismic waveform, the unified model of the coseismic rupture process is obtained by joint inversion based on finite fault theory. At the same time, the waveform data of the regional network in Europe are collected, and the time and space distribution of the high-frequency rupture is obtained by back projection method. The joint inversion results show that the rupture scale is 400km, the seismic moment is 6.1×10²⁰Nm, and the corresponding moment magnitude is 7.78. The main fault rupture has experienced three stages, the supershear rupture stage corresponds to the largest dislocation area, and the rupture velocity and scale decrease rapidly when it breaks to the intersection between the Xidatan section and the Kunlun Mountain Pass fault. The back projection result shows three stages of rupture, which correspond to the three largest rupture zones of geodetic inversion in space, and the propagation speed of the largest rupture zone reaches 6km/s, but the super-shear rupture stops at the position where the fault strike changes about 30km east of the fault intersection.