According to the characteristics of the subject relationship and the dynamic demand of the usage control of government information resources, a control method of the dynamic usage of government information resources based on the improved UCON_ABC model is proposed. This method combines rolebased access control with dynamic usage control to improve the UCON_ABC model. Furthermore, we design a predecision model for the dynamic usage control of government information resources based on the authorization, responsibility, condition and other usage control strategies of UCON_ABC. Based on the improved UCON_ABC model in a typical scenario of the usage control of government information resources, and by comparing with the typical traditional usage control methods, the advantages of the improved UCON_ABC model are verified. The results show that the improved model can reduce the management difficulty of UCON ABC model, and better adapt to the dynamic needs of the usage control of government information resources.