This design is the design of automobile drive axle. Through this design, we can better understand the drive axle, understand the structure and working principle of the drive axle, and exercise our practical ability. At the same time, we also have a better grasp of the method of accessing data, which runs through the knowledge we have learned in our university. It means that we can make better use of the theoretical knowledge we have learned, combine theory with practice, and better grasp the essence of it. There is a close relationship between design and specialty, which can comprehensively utilize the knowledge of automobile structure, automobile design, mechanical design, automobile theory and CAD drawing. And laid a good foundation for our future work.