In this paper, an augmented user equilibrium model and solving algorithm are proposed and then a new approach for the O-D matrix estimation problem from link traffic flows is also proposed. 首先给出了一种增广的用户平衡配流问题的优化模型及求解算法,然后提出了一个从路段流量估计OD交通量的双层规划模型及求解算法。