The driving axle of automobile is an important part of automobile transmission system, which bears the full load of automobile and the vertical force, transverse force, longitudinal force, vertical force and its moment, as well as the impact load given by the ground through wheels and frame; The drive axle not only transmits the maximum torque in the drive train. The structural type and design parameters of automobile drive axle have direct influence on automobile power performance, economy, ride comfort and passability. The structural type selection, design parameters selection and design calculation of drive axle are extremely important to the whole vehicle design and performance.