This paper mainly analyzes the intake system of FSAE car engine, which can comply with the rules of the game designed and meet the requirements of highspeed and stability performance of FSAE, the plenum chamber is installed in the engine air intake system. First ,design the structure of the engine air intake system on our school team competition car , using CATIA software to realize parameterized modeling, two air intake system of 3 d model (with and without plenum chamber) , then imported into ANSYS software with fluid mechanics analysis. Through comparative analysis shows that the intake system with plenum chamber certain advantages in Velocity uniformity and pressure stability.