Abstract: First analyze the source of fluid-borne vibration and noise as well as the fluid acoustic powers in hydraulic power systems. Then, a newly devieed "2 pressures/2 systems" method is presented to measure the fluid-borne vibratio characteristics (flow ripple and source impedance) of pumps. With this method, not only the hydraulic test circuit and calculation procedure become very simple compared to the former methods but also the tests can be performed very quickly. At last, a hydraulic simulation package is developed to simulate and analyze the pressure pulsations in any hydraulic pipelines generated by fluid power pumps. The experiments shows that the calculated results obtained by the present simulation package agree with the experimental results with sufficient accuracy for practical use.