Morphological matrix method and its key legal point of view the main function of the program from portfolio analysis, and then the combination of a good program to list, due to the combination of a lot of the number of programs, and therefore difficult to compare them one by one evaluation, it is difficult to get the best program. The main problem lies in the expert system knowledge acquisition and reasoning more difficult. Intelligent design of the car's mechanical system is actually an instance of reasoning and matching process. In this paper, automotive Intelligent Design System Based on CBR and RBR in an attempt to improve the efficiency of product design. ICAD system technology and artificial intelligence expert system optimization design, finite element analysis, computer graphics and other various numerical calculation methods combine their respective merits, complement each other, the aim is to make the computer as much as possible to participate in decision - making, structural design, performance analysis, graphics and so the whole process.