In order to improve the volumetric efficiency, extend the working life, reduce vibration and noise of axial piston pump with swash plate, it is very important to determine the operatingspeed range reasonably. In this paper, the relationship of piston speed and load between the efficiency, flow pulsation and noise of the piston pump was studied based on FLUENT platform.The simulation results show that the piston pump volumetric efficiency rises as the speed increases and the load decreases, and the flow pulsation decreases with the decreases of the load and the speed increases, while the noise rises with the load and speed increases. Then the simulation results are validated by experiment test and the results comparison indicates that the accuracy of the simulation is acceptable，it is also provides a credible method to the dynamics modeling ofaxial piston pump and simulation analysis of global performance electrohydraulic system.