Ropehook recovery system, as a assigned spot and nondestructive recovery program for fixedwing unmanned aerial vehicle(UAV), has developed rapidly both at home and abroad in recent years. In this paper, two kinds of dynamic model for Rope hook recovery system are established by parameterization. First, the Lagrange equation of the Ropehook recovery system is established based on the flexible recovery frame. Secondly, the multibody dynamics simulation model of the recovery system based on MSC.ADAMS is established by considering the deformation of the rope and the details of the system structure. The dynamic characteristics of UAV in the recovery process are analyzed. Finally, the applicability and effectiveness of the two dynamic simulation models in the different design stages of the Ropehook recovery system are determined by comparing the simulation results with the test results.