This paper is divided into six parts. It introduces the application progress of steel-aluminum hybrid body structure both in home and abroad，the development technology of steel-aluminum mixed body structure both in home and abroad，the connection technology of steel-aluminum mixed body both at home and abroad. It explains the opportunities and challenges faced by the application technology in the development of steel-aluminum hybrid body in China and describes the future development of steel-aluminum hybrid body technology. In the conclusion，it is pointed out that the breakthrough of the the aluminum-alloy-related die-casting technology and the connection technology of dissimilar materials are key process technologies that need to be solved. With the development of China’s new energy electric vehicles and the support of national policies，the related basic technology research and development has also achieved rapid development. Domestic R&D personnel should firmly grasp the opportunities of the times，meet the challenges，and achieve cornering overtaking in technological innovation.