Independent hydro pneumatic suspension makes each vehicle suspension duties and has no direct effect on each other.With nonlinear variable stiffness and variable damping characteristics,the damping effect is good,and it is widely used in construction vehicles.Single cylinder hydro pneumatic suspension was the research object.According to the structure characteristics;the mathematical model of single cylinder independent hydro pneumatic suspension was established to get performance parameters having significantly impact.The simulation model of the single cylinder hydro pneumatic suspension was built based on AMESim and the test bench of the suspension was built.The parameters of the hydraulic cylinder,damping valve,accumulator,oil and other components in the model were set according to the size of each component in the test bench.The effects of the parameters change on the differential pressure of the damping hole at both ends and the force of the piston rod were comparative analyzed by simulation and test.The results show that the force of the piston rod is increased with the increase of the accumulator pressure.With the increase of the frequency of the cylinder,the pressure difference between the two ends of the damping hole and the piston rod force all become large.When the damping hole diameter decreases,the pressure difference between the two ends of the damping hole and the piston rod force are reduced;and the damping hole is more smaller,the maximum values of the pressure difference between the two ends of the piston rod force are basically unchanged.The simulation results are consistent with the experimental results,and the maximum error is no more than 10%.