The increasingly fierce competition in the industry encourages the automobile manufacturers to speed up the development of new products,which puts forward higher requirements for the verification efficiency and accuracy of the synchronous engineering of new models.Body electrophoresis film thickness is one of the most important anti-rust quality verification projects in synchronous engineering.Due to its many influencing factors and complex principles,it is difficult to accurately judge according to previous experience,so it is necessary to implement D1 car autopsy verification.But this method is time-consuming,high cost,and the verification cycle of countermeasures is long,which is difficult to meet the needs of the rapid development of new models today.With the advantages of CAE analysis method with high precision and short analysis time,the above problems can be solved well.This paper mainly introduces a case of using CAE simulation analysis method to optimize the anti-rust style of car body.