According to the physical model parameters of the plunger pump, the hydraulic model and the dynamic model of the axial piston pump were constructed in the AMESim and ADAMS environments respectively. The liquidsolid coupling axial piston pump virtual prototype model was built through the bottom interface of the two models. Based on the virtual prototype, the forward and reverse rotation characteristics of the EHA threeport asymmetric piston pump were studied. The results show that with the increase of the rotational speed, the pulsation rate of the outlet flow of the piston pump decreases; with the increase of the load, the axial hydraulic pressure of the single plunger increases, and the input torque of the pump increases.In the case of a reversal, the greater flow fluctuation and pressure overshoot will occur when the piston passes through the nondead point transition area between the distribution windows of the threeport axial piston pump. On this basis, the correctness of the simulation results and design parameters is verified by experiments