Abstract: In order to improve the starting performance of the tractor equipped with hydro-mechanical continuously variable transmission, a starting control method based on displacement prediction adjustment was proposed. By analyzing the working principle of HMCVT and the working characteristics of the displacement regulating mechanism, the tractor start process is divided into three stages, in order to reduce the starting time and the starting impact degree, the control strategy of the starting process displacement control of the tractor based on the model prediction control is established. The Simulation results indicate that compared with not using the model predictive control method, The starting time of hydraulic mechanical infinitely variable speed tractor was shortened by 8%, the maximum degree of jerk is reduced by 32.6%, which has better control effect on the starting process of the tractor, and the starting performance is greatly improved.