Taking the positive flow control excavator hydraulic system as the research object,the mathematical models of the main pump displacement regulation system and multi-way reversing system were established,and the AMESim simulation model was built to explore the response characteristics of the pump valve system in the opening process of the bucket main valve.Aiming at the problems such as excessive fluctuation of the flow and pressure at the valve port and improper matching of the speed response during the opening process of the bucket main valve,an response matching optimization scheme between positive control pump and valve control system was proposed through proportional reducing coefficient between pilot pressure and pump displacement and optimizing the characteristic parameters of throttling groove,and the effectiveness of the optimization scheme was verified by experiments.The results show that the flow fluctuation amplitude and pressure fluctuation of the optimized spool in the opening stage are significantly reduced,with the flow fluctuation amplitude reduced by 18.19% and the peak pressure fluctuation reduced by 2.8 MPa.