In order to optimize the steering trapezoid of formula racing car

based on the kinematics characteristics of the steering trapezoid

as well the data of steering angle collected by data logger in the race

the mathematics model as the goal of ideal Ackerman geometrical relationship is built by the introduction of weight factors

then the optimization is performed by using nonlinear least square method.By applying mechanical system simulation software ADAMS

the whole model of racing car is built

and its accuracy is verified by the experiment

then the comparison of the handling characteristics is performed.The virtual test shows that

after optimization

the tendency to understeer of the racing car is aggravated

the rangeability of wheel track decreases and the outer tire can provide more lateral force because the increase of verticality to the ground

and the rangeability of toe angle decreases when tires jump.It provides reference for the design of steering trapezoid of racing car.