A method of designing the change slot curve is proposed. Using the kinematic simulation software ADMAS to simplify the modeling of the gearshift mechanism,the shift slot curve is simplified to the polyline and Gcurve curves,and the design variables are associated with the curve. The objective function is set up for design study and optimization. the best change slot curve is obtained in the post-processing. The simulation results are close to the control force feedback curve by actual measurement. The method predicts the change slot performance at the design phase,which is helpful to finding t...