Due to the adaptive transmission components of the hydraulic torque converter, compact planetary gear transmission mechanism and proportional valve precise control of the multi-clutch control system, AT transmission has good road adaptation, outstanding starting and acceleration characteristics, high power density, comfort shift process and other advantages. It is widely used in military, mining and other vehicles with complex road conditions and requiring high mobility flexibility. The combination of the multi-degree of freedom planetary transmission mechanism and the clutch highlights the power shift advantage of the AT transmission. By analyzing the working principle and characteristics of the AT transmission clutch, this paper establishes its Simulink model, which lays a foundation for the vehicle dynamics model.