Grey related degree model for the optimization of urban public transport network

On the basis of considering each factor of urban public transport network,the optimization function expression and the restricted conditions of urban public transport network were presented.Based on the best scheme's definition,the schemes were arranged in simple order according to the distance between each scheme and the best scheme by grey related degree,so the decision making model for the optimization of urban public transport network was presented.Applied results indicate that the method improve the used ratio of urban public transport network,the method is feasible.Thus we provide another reasonable and effective method for the multiple attribute decision problems.