In order to solve the problem that the common proportional valve amplifier cant realize the impact of the load sensitive hydraulic system because of its slow response,the fast response PWM port of the vehicle PLC was used to directly drive the main valve to realize the fast response control,and the impact characteristics of the load sensitive hydraulic system were studied.Taking the load sensitive hydraulic system constructed by A10VSO28DFR pump and M4-12 valve as the object,the upper and lower computer communication mode was adopted to realize the control and parameter acquisition of impact experiment.For the upper computer,LabVIEW was taken as the software platform,the pressure and flow parameters of the hydraulic system were collected through NI9223 board card,the function control of the hydraulic system was realized through PEAK USB/CAN card,and the parameter collection system and can bus communication system of the hydraulic system were designed by using queue message mechanism,global variables and multi thread programming mode.For the lower computer,Hersmor G16 controller was used to design the hydraulic valve control system,to receive the control command from the upper computer,and to realize the timing closing and opening size control of the main valve.The impact characteristic test was carried out on the hydraulic test bench.The results show that the designed measurement and control system can control the closing speed and opening size of the main valve on the basis of 10 ms;the impact characteristic curve can be collected correctly by the way of queue,the designed measurement and control system can meet the impact characteristic test requirements of the load sensitive hydraulic system.The validity of the impact characteristic reducing method through eliminating excess flow is verified by the bench,and the stability of the system is improved.This proposed measurement and control scheme of hydraulic valve driven by PLC,provides reference for the performance research of hydraulic measurement and control platform and hydraulic system.