在考虑信息不完全的情况下，用灰色模糊数对公交线网优化问题进行了研究。在给出了公交线网优化的约束条件与优化目标的基础上，利用灰色模糊数建立了公交线网优化的决策模型。灰色模糊数是用三参数区间参与优化过程，在允许参数在一定范围内变化的情况下，计算后得到的结果是一个区间向量，其中向量值最大的为所求结果，适用于城市公交线网的优化问题。实例应用分析表明，优化后的公交线网效率提高，可达性良好，可满足城市公交可持续发展的要求。

On the basis of considering each factor of urban public traffic line network,  the decision-making method for the optimization of urban public traffic line network is set up by grey theory and fuzzy theory.  This paper proposes to use interval numbers of three parameters to present grey fuzzy numbers.  A comprehensive optimization method for urban public traffic line network is given by using theories above.  It was applied to the practical optimization of urban public traffic line network in the city.  Applied results indicate that the method improves the efficiency of urban public traffic line network.