Aiming at closed pump truck pumping hydraulic system modeling is difficult,the actual structure parameters of key components are difficult to obtain resulting in low precision of simulation model,the closed pump truck pumping hydraulic system dynamic characteristic analysis is difficult,by measuring pumping hydraulic system key element 3D models,AMESim simulation platform was used to model in detail,so the simulation model was more close to actual.The simulation model of each key component was established and the whole loop was built according to the principle diagram.The test pump truck empty pump test was carried out to verify the correctness of the simulation model.Finally,the water valve load was controlled to simulate concrete load as the system load.The results show that the simulation model can accurately simulate the dynamic variation of the closed system,and the error range is within 8%.