For the demand of synchronization control of a vehicle-monted hydraulic support system, a synchronization control strategy of support cylinders is presented. Mathematical models of asymmetric hydraulic cylinder and electro-hydraulic proportional control valve were established based on specific vehicle hydraulic system as the research object. With respect to the load volume function which depends on the output displacement of cylinder, corresponding Simulink model was built. Thus the output displacement was returned to volume function, while the iteration of the hydraulic system dynamic characteristics were simulated. And cross-coupling control method was adopted for synchronization control of the two cylinders. The results through simulation analysis show that the hydraulic system synchronization control strategy is good with high synchronization accuracy, fast response.