Aiming at the problems of large errors and imprecision caused by the function simplification of the control mechanism and its motion relation in the modeling process of the plunger pump,a non-simplified modeling method based on the motion correlation of the control mechanism was proposed.Combined with the control principle of the plunger pump,a plunger pump simulation model of power-pressure-electricity proportional composite control was built by AMESim.Through the combination control of pressure,current and speed,the control characteristics of the piston pump were simulated,and the dynamic characteristic curves in accordance with the theoretical research were obtained.The plunger pump was tested by bench test.The test results show that the plunger pump has response time in practice,and the system flow rate has impact and oscillation at the moment of opening and closing of the hydraulic system.Compared with the simulation results of the two modeling ideas,the maximum relative errors of the non-simplified model are 3.51% and 5.08%,and the average relative errors are 1.74% and 1.98%,respectively,which are both smaller than the simplified model.Accurate modeling of piston pump provides model support for product performance optimization and system digital twinning.