Aiming at the influence of rigid-flexible coupling deformation of excavator working device on the dynamic characteristics of hydraulic control system,virtual prototype modeling and co-simulation technology were combined to study dynamic characteristics.The 3D model of the excavator was established by using UG software.After being flexibly processed by finite element software,it was imported into ADAMS software to construct a virtual prototype of the excavator.The closed-loop hydraulic control system of the excavator was established by using AMESim software and the principle of load sensing.The rigid-flexible coupling simulation model of the mechanical and electrical integration of excavator was established through co-simulation.The simulation study was conducted on the typical excavation condition and heavy load lifting condition of excavator.The results show that the hydraulic control system of excavator based on rigid-flexible coupling modeling has strong dynamic stability.The maximum position error under heavy load conditions is less than 0.01 m,and the position accuracy is high.The modeling simulation of rigid-flexible coupling integration of excavator is realized.