For a better “S” type trajectory of the carbon-free car, applies the parametric modeling capabilities and simulation capabilities of the ADAMS software to simulate the crank-rocker mechanism, sine mechanism and RSSR space four-bar linkage mechanism for carbon-free car steering mechanism. Compares the simulation results and draws the conclusion that sine mechanism is the best direction-control mechanism for the carbon-free car through the relative parameter design. It provides theoretical reference for steering mechanism design of carbon-free car.