To solve the side-slip problem of carbon-free car, applies Adams software parametric modeling functions and simulation capabilities to detect the impact of the front wheel position of carbon-free car on the trajectory linearity. Analyzes and compares the experimental data with Matlab software .The results show that the front wheel on the side of the drive wheels obtains better running track, and the coplanar for the front wheel and the drive wheel are more conducive to ensure the car frame centroid trajectory straightness.