提出了一种基于LOG IT方法的交通分配模型,该模型是动态出发时间选择和随机用户平衡的联合模型(DDSUE)。作为一种基于全路径的交通分配模型,在路径选择上,使用了LOG IT模型求出每条路径的选择概率;在出发时间选择上,采用路径通行能力和路径选择概率来联合确定交通出发量,然后利用总交通出发量和路径选择概率求出每条路径上的驶入量。最后以一个实际算例,并通过改变参数对结果进行了分析。 A traffic assignment model based on LOG IT is proposed, which is a joint model (DDSUE) of dynamic departure time selection and stochastic user balance. As a kind of traffic assignment model based on full path, LOG IT model is used to find out the selection probability of each path based on the path selection. On departure time selection, the path traffic capacity and path selection probability are used to determine the traffic departure amount , And then use the total traffic departure and route selection probability to find out the amount of each path. Finally, an actual example is given and the result is analyzed by changing the parameters.