In order to solve the problem that zero position of the steering wheel did not correspond to that of the ground wheel in the turning back process of the full hydraulic steering system,an electronic control synchronous full hydraulic steering system was developed.The STC15F2K60S2 MCU was used as the core.In the controller, corner deviation calculation was conducted according to the corner data collected by the sensor, and the corresponding compensation algorithm was designed to achieve oil compensation by controlling solenoid valve so as to eliminate the corner deviation.Eventually, zero position of the steering wheel does correspond to that of the ground wheel in the turning back process of the full hydraulic steering system, and the operation of driver will be more convenient and secure.