In order to solve that the single execution component and mechanics-motor composite braking cannot meet the braking requirement of electric drive high speed tracked vehicle, the method of mechanical brake, motor and electro hydraulic retarder composite braking is proposed. Through the analysis of the mechanical brake, motor and electro hydraulic retarder braking characteristics, the steady braking force distribution control strategy based on fuzzy control and the dynamic coordinated control strategy have been proposed; the model of simulation was built in Mat lab/Simulink and real time simulation system RT-LAB was using to establish the “Driver-controller” in ring real time simulation system of electric drive high speed tracked vehicle and the verification of simulation experiment was carried out. The results show that the system can well meet the braking requirement of the electric drive high speed tracked vehicle and the control strategy proves the feasibility of control algorithm, which provides a theoretical basis for the research of high speed braking of the tracked vehicle. Introduction The electric drive technology is an important research direction of the tracked vehicle propulsion system. With the development of high speed, heavy load and automation, the vehicle has put forward higher and higher requirements on the stability, reliability, controllability and maneuverability of the vehicle braking system. The single execution component is difficult to meet the requirements of the braking ability of electric drive high speed tracked vehicle. Making use of a variety of execution components to ensure the braking performance of the vehicle braking is the future development direction of high speed track vehicle braking system. Each of the literature [1-5] employs two execution components to form composite braking, which involves fewer brake parts, relatively simple control strategy, and did not take into account the influence on the braking performance of dynamic response process, using off-line simulation to validate the strategy. But the speed of electric drive high speed tracked vehicle which is higher than 80km/h, the current literatures lack such high speed braking research. So electric drive high speed tracked vehicle mechanics-motor-retarder composite braking fuzzy control strategy is proposed for the first time, namely to add electro hydraulic retarder which is new auxiliary braking device to traditional mechanics-motor composite braking system forming mechanics-motor-retarder composite braking; the three dynamic response time is considered generally and the fluctuation in the switching process of braking mode is reduced, at the same time the vehicle braking performance is improved. At last make use of real-time simulation to validate the strategy. The results show that the strategy meets the braking requirements and effectively improves the dynamic performance of the vehicle braking. Analysis of Mechanics-Motor-Retarder Composite Braking System According to the braking requirement of the high speed tracked vehicle, the designed mechanics594 Advances in Engineering Research (AER), volume 105 3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016) Copyright © 2017, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). motor-retarder composite braking system is composed of mechanical brake, permanent magnet synchronous motor and electro hydraulic retarder. The braking performance of mechanical brake at low speed is stable; the temperature of brake rises high when the speed of vehicle becomes fast, which will intensify abrasions and reduce braking efficiency [6]. The torque of permanent magnet synchronous motor is small when the speed is high, but it can realize energy recovery, and fast response; with the decline of speed in motor, braking torque is increasing; when the motor speed is reduced to a certain extent, restraint of the characteristics of the motor, braking torque is zero, but the speed is not zero, unable to realize the stop of vehicle [7]. Electro hydraulic retarder is a new auxiliary brake device for vehicle and has a large braking torque, small air loss torque, fast response of speed and other advantages. Mainly consists of the stator, a pair of salient pole rotor and the ring exciting coil. Salient pole rotor is H rotary table, and transmission device is attached to the output shaft; as an independent annular excitation coil, it is mounted on the inner side of the stator of retarder. Vehicle transmission output shaft drives retarder rotor rotating; when the vehicle is braking, battery of the vehicle provides current for the excitation coil of the retarder, generating a magnetic field; on the inner surface of retarder stator produces eddy current, resulting in brake torque, the heat generated can be cooled by water away [8]. Structure is shown in Fig. 1. Stator Salient pole rotor