Transmission system and control method thereof

The invention relates to the technical field of vehicles, and particularly discloses a transmission system and a control method thereof. The transmission system comprises an engine, a hydraulic pump,a hydraulic motor, a clutch, a main deceleration mechanism, a differential mechanism and two half-axle assemblies, the hydraulic pump is configured to be connected with the engine in a transmission mode, two output ports of the hydraulic motor are connected with two output ports of the hydraulic pump correspondingly, the hydraulic motor and the hydraulic pump form a closed loop, one end of the clutch is connected with the hydraulic motor, the other end of the clutch is connected with the input end of the main deceleration mechanism, the output end of the main deceleration mechanism is connected with the differential mechanism, the differential mechanism is connected with the two half-axle assemblies, and the two half-axle assemblies are used for driving front wheels at the two ends of a front axle frame to rotate