Dual clutch transmission is one of the key components for the development of modern electric vehicles. The basic principle and control method of gear-shifting of wet dual clutch transmission are introduced， and the dynamic process of gear-shifting of wet dual clutch transmission is studied. Combined with the dynamic model of the wet clutch engagement process， the Coulomb friction model， the average flow model， and the micro-convex contact theory were used to model the dual clutch transmission. The differences between the two models were discussed. Studies indicate that the torque response of wet clutches has significant hysteresis， but the Coulomb friction model cannot capture this hysteresis. Based on the dynamic model of the wet clutch， the torque interruption of the shift control strategy of the dual clutch transmission is studied in this paper. The results are compared with the simulation results of the Coulomb friction model. The transmission model can more accurately reveal the dynamic characteristics of the transmitted torque during the shift.