In sociology, the role concept is deeply researched to predict activities of human organizations and theorized with many sub-theories. In the same direction, multi-agent system researchers use the role concept to model and program the agents behaviours, cooperations. But there is an important point missed out by the MAS researchers: evolution of the organization. In this paper, by inspiring from the eorts in sociology, we propose an evolutionary role model for coping with the evolution of the role-based multi-agent systems.