Flow pulsation characteristic is the inherent characteristic of the axial plunger pump, and it is an important factor that affects the working performance and the stability of the hydraulic system. To reduce the flow pulsation of axial plunger pump, theoretical analysis of the motion characteristics and flow pulsation characteristic are carried out. The simulation model was built based on the AMESim software to obtain the flow pulsation curves of different plunger number, speed and angle of inclination of the inclined disc case. The research results show that the flow pulsation of the axial piston pump decreases with the increase of the number of the plunger, the rotational speed and the angle of inclination of the inclined disc, which provide the reference for reducing the flow pulsation of plunger pump.