Abstract: Coalition formation is a key topic in multi-agent systems. It mainly deals with the coalition's utility distribution among agents according to their preferences. Existing strategies have an inextricable free-rider problem, which can not clearly distinguish each agent's contribution and may result in coalition's potential instability. In order to tackle the shortage above, a novel coalition formation strategy based on rational agents is presented, which is restricted by the principle of impartial distribution and non-jealous standard, and improves the justice of allocation for additional utility. In superadditive task oriented domains, the proposed strategy can reach a global-optimal coalition, which is stable with Nash equilibrium.