In view of the gear rack steering gear test system as the object, the asymmetric cylinder hydraulic steering gear and rack AMESim simulation model test system is established, and the symmetrical valve controlled asymmetrical cylinder speed characteristic is analyzed. Based on Simulink/XPC Target module environment, real time online monitoring and control system was developed. The asymmetric cylinder of the hydraulic steering gear and rack simulation testing experiment was set up. The experimental results show that the physical simulation results and the AMESim simulation results have good consistency.