Aiming at the problems of pipeline damage and leakage caused by hydraulic impact of sugarcane harvester operating in hilly areas, taking the hydraulic system of the cutting mechanism with the largest output power as the research object,AMESim simulation software was used to establish a simulation model of the hydraulic load sensitive system of the cutting mechanism. The influences of the opening and closing time of the load-sensitive valve, the length of the oil supply pipeline from the load-sensitive pump outlet to the load-sensitive valve, and the feedback pipeline length of the sensitive pump valve on the pressure impact of the system were studied. The simulation results show that shortening the opening time of the reversing valve and extending the closing time of the reversing valve can effectively reduce the hydraulic impact of the system, shortening the length of the pump outlet pipeline and extending the length of the pump valve feedback pipeline can effectively slow down the hydraulic impact of the system. The conclusions obtained by experiment are basically consistent with the simulation results: when the response time of the reversing valve opening and closing is the minimum and maximum values of the product sample parameters respectively, the hydraulic impact amplitude is reduced by 13.6% and 33.1% respectively; for every 0.5 m reduction in the length of the pipeline from the pump outlet to the sensitive valve, the system impact is reduced by about 0.5 MPa； for each 0.5 m extension of the feedback pipeline length, the system pressure shock drops by about 0.808 MPa.