In order to study high and low cycle fatigue experiment bench control technology of a certain type of aircraft engine fan blade, we can reach the purpose of reducing the pressure pulsation of system and improving the stability of the test loading force. By means of simulation, we first designed the experiment bench model of high-low cycle fatigue based on MATLAB/SimHydraulics. Then on the basis of the system model, we completed the simulation according to the following steps: changing the position and loading ways of the accumulator in the hydraulic test bench; matching the system with different parameters. From the study can we find that the simulation of high-low cycle fatigue test rig has reached the expected purpose. At the same time, we got the effective parameter selection. In the process of simulation, we also found that the introduction of the accumulator can give great buffer effect to pressure pulsation which produced by the sudden closing of valves. At the mean time, the accumulator can bring more stable loading force. In conclusion, this study can provide necessary guidance to the design and production of experiment bench, so that we can get better experiment results.