The up-shift process of the DCT adopted on a tracked vehicle is taken as the research object.The up-shift dynamic equations are derived according to the detailed analysis of up-shifts and the traditional up-shift control strategies are summarized.A new up-shift control strategy with united pressure control is proposed based on the traditional control methods.Two analytical models for simulation are built by means of Matlab/Simulink.During the up-shift process,the oil pressure in on-coming clutch is controlled by a proportion controller,while the oil pressure in off-going clutch is controlled by the traditional method and the new method with united pressure control respectively.It’s found that compared with the traditional method,united pressure control method can avoid negative torque and produce less friction work,which results in better shift quality.