As dynamic transition component between propellant storage and barrel, coordinator is one of the key components of achieving full auto loading of propellant of self-propelled artillery. It established a 3D solid model of one coordinator with UG software, and established a flexible body of coordinating arm with ANSYS software, and established a mechanical system model of coordinator that rigid body and flexible body were mixed. And on this basis, it has established a virtual prototype of coordinator that mechanical system and hydraulic system are coupled. Hydromechatronics simulation was completed by using ADAMS and MATLAB software. According to the test results of simulation, it analyzed the dynamic response of coordinator, the vibration and elastic deformation of flexible body and the performance of hydraulic system. The results show that the method of modeling and the results of simulation have some reference value for the design of the coordinator and other similar products.