After taking a body-in-white of China-made passenger car as the analys is object and utilizing Hyper Works software, the finite element modal of body shell of the body-in-white is set up and the main factors that impact the modal of body-in white are analyzed. Focus on the first eight order modes, the analysis result shows that the error can be controlled in 10% compared with the modal tests. This provides the important modal parameters for the research of dynamic response of body-in-white, and it also provides the theoretical foundation for the improvement of structure design of body-in-white.