Abstract: In this paper, the rigid-flexible coupling dynamics of satellite solar battery with multi point contact-impact is investigated. Based on Jourdain’s variational principle and forward recursive formulation, the dynamic model of flexible multibody systems with contact impact is established. According to Hertz’s impact law, the relation between the impact force and local deformation is obtained. The contact-impact of satellite plates is simulated by using rigid model and flexible model, respectively. The time histories of the impact force, impact time are calculated to reveal the coupling of the large overall motion and deformation.