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Based on fuzzy control and PID control, a new type of fuzzy self-tuning PID controller was designed. The controller worked for synchronization control of hydrostatic transmission with dual pump and dual motor, which was used to drive a high speed light duty tracked vehicle. The results of simulation and tests showed that during straight running, the controller could restrain the motor speed error effectively when suffering different load disturbances, meanwhile it could get good synchronization results and the synchronization control was quite robust. The new control system is better than common PID control and is suitable for high speed tracked vehicle hydrostatic transmission.