Aiming at the vehicle hydraulic air conditioning system of a certain type of truck crane, is easy to appear faults such as instantaneous fracture of the drive compressor belt, oil leakage of the motor oil seal and ablation of the reversing solenoid valve coil,a hydraulic driven air conditioning system was optimized by the structural transformation of the ordinary two-way cartridge valve. After testing, the improved system scheme meets its application requirements, which is more applicable, and can further reduce the opening buffer of the hydraulic motor. Market application shows that the service life of air conditioning compressor belt is significantly extended, there is no instantaneous belt fracture and solenoid valve coil burning fault.