In this study, a theoretical nonlinear dynamic model was established for a saddle ring based on a dy-namic force analysis of the launching process and the structure according to contact-impact theory. The ADAMS software was used to build a parameterized dynamic model of the saddle ring. A parameter identification method for the ring was proposed based on the particle swarm optimization algorithm. A loading test was designed and performed several times at different elevation angles. The response his-tories of the saddle ring with different loads were then obtained. The parameters of the saddle ring dynamic model were identified from statistics generated at a 50℃ elevation angle to verify the feasibility and accuracy of the proposed method. The actual loading history of the ring at a 70℃ elevation angle was taken as the model input. The response histories of the ring under these working conditions were ob-tained through a simulation. The simulation results agreed with the actual response. Thus, the effec-tiveness and applicability of the proposed dynamic model were verified, and it provides an effective method for modeling saddle rings.