In order to accurately simulate the dynamic process of the cable rupture event, based on the alternate load path (ALP) method, the numerical simulation methods for dynamic analysis of suspension bridges subjected to hanger-breakage event are studied. Taking a prototype self-anchored suspension bridge as the background, the basic principles and characteristics of three methods (e.g., the instantaneous stiffness degradation method, the instantaneous loading method and the equivalent unloading method) are illustrated. In addition, the influencing factors on structural dynamic effect of the collapse responses are quantitatively analyzed. The results indicate that the instantaneous stiffness degradation method is simple and effective to simulate the dynamic process of the hanger-breakage event. The hanger loss induced dynamic responses are closely associated with the influencing factors, such as the broken hanger elements in the finite element model, the duration and time-dependent tension loss function of the breakage process, and hanger loss scenarios.