The frequency response characteristics of pressure oil pipeline under the change of velocity and pressure were studied by means of simulation and experiment.The experiment was carried out on the vibration simulation test-bed of hydraulic pipeline,a certain EVM8 vibration monitoring and analysis system was used.In the system,embedded system kernel,high sampling rate and high precision A/D module,adaptive amplifier circuit,signal frequency automatic tracking and anti aliasing filter based on CPLD were adopted,and the system had high test accuracy.Through experiments,the natural frequency of oil pipeline vibration was obtained.According to the calculation results,the influence of hydraulic oil flow rate and pressure change on the natural frequency of oil the pipeline was analyzed.The frequency response characteristics under different flow rate and pressure in oil pipeline were analyzed.The results show that when the pressure in the pipeline is constant,the natural response frequency of each order of pipeline decreases with the increase of fluid flow rate;when the flow rate is constant,the natural response frequency of each order of pipeline increases with the increase of pressure.