Through the threeaxis hydraulic steering experiment platform, the steering hydraulic system model was established by using AMEsim software. The influence rules of the pressure, flow, pipe length, pipe inner diameter and material and such as single factor on steering cylinder response characteristics were analyzed. The orthogonal simulation experiment was performed by aimed at the nonlinear influence factors such as pressure, flow, pipe inner diameter and the system PID parameters, and the optimization results and the PID parameters were presented. The results show that: with increasing of pressure, the response speed is accelerated, but it is relatively stable within the range of 10~11 MPa. When the flow is at 14 L/min, response is fastest and most unstable. It has high response speed and stability for pipe diameter in the range of 11 to 17 mm. With increasing of pipe length, the response is lagged with lower stability. Proportion coefficient P is sensitive to the response time, integral coefficient I has larger influence to the smoothness, and differential coefficient D is quite sensitive to stability.