Abstract: Some RF cables will have go cross the work region of space deployable assemblies, which might influence the expansion characteristics (especially for the passive deployable mechanism), and even affect the functions and performance of spacecraft. With a deployable antenna array, its semi-rigid RF cable and the passive deployment mechanism as an example, this paper discusses the dynamics modeling and the simulation process. The modeling and the simulation of the antenna array in the context of the orbit deployment dynamics are validated by the measured data on orbit. It is shown that the simulation data and the measured data are basically consistent, the influence of the RF cable for the deployable antenna array on the orbit deployment characteristics can be accurately assessed. At the same time, the modeling and the simulation can also be applied to other types of accessories of a satellite.