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A DCT structure, which adopted on a certain tracked vehicle, was proposed and system dynamic equations were derived according to the detailed analysis of upshifts and downshifts. The analytical model for the simulation, analysis and control of shift dynamics for DCT vehicles was built by means of Matlab/Simulink. An upshift and a downshift were simulated as case study and simulation results displayed the parameters have important influence on shift quality. A PID controller was proposed to control the oil pressure in on-coming clutch in upshift process and a PI controller was also put forward to control oil throttle in downshift process. Such control strategies can avoid clutch tie-up and engine flare, result in better shift quality.