Abstract: Coalition utility allocation is a hard question when many agents form a coalition to solve tasks. The current strategies, based on equality or capability vectors, do not demonstrate the difference of agents’ contribution to a coalition, and this will go against coalition formation .In this paper, a method is presented to allocate coalition utility based on fuzzy evaluation. First we evaluate contribution ratio in agent’s all-dimension capabilities, then get the contribution factor, by this means, we give a rational allocation of coalition utility. Moreover, a simulation example is presented to illustrate the validity of the proposed method.