The design of the two-axis mechanical transmission for passenger cars. Based on the vehicle's shape, wheelbase, wheelbase, minimum turning radius, minimum ground clearance, full load, vehicle weight and maximum speed, the maximum Torque, maximum power and displacement of the engine can be obtained by selecting the engine type suitable for the passenger car. According to some basic parameters of passenger car, the appropriate main deceleration ratio is selected. According to the above parameters, the relevant parameters of the transmission are calculated and the reasonable design is carried out.