According to the braking requirement of high speed electric drive tracked vehicle, the method of mechanical-electric-hydraulic composite braking was put forward. Through the analysis on the breaking characteristics of mechanical brake, and motor and electric hydraulic retarder, the method of motor braking force fuzzy control distribution and the feedforward-feedback two degree of freedom dynamic coordinated control algorithm were formalated. In the composite braking system, the braking intention of driver was realized by the brake pedal, and other executive components were achieved by simulation model. Semi-physical real-time simulation system of the brake pedal in the ring time simulation model was established by RT-LAB, i n which the braking process could be watched by the software. Finally, the verification of simulation experiment of low-speed emergency braking, middle-speed composite braking and high-speed progressive braking was carried out. The results show that real time simulation system could meet the requirement of the high speed electric drive tracked vehicle, well verifies the feasibility and realizability of the control algorithm. This research provided theoretical and experimental basis for the further research on high speed electric drive tracked vehicle composite braking technology.