In order to solve the problem of path-based dynamic traffic distribution, the problem of reasonable set of paths between each start and end point is generated. Firstly, the commonly used path set generation methods, such as Dial algorithm, road section deletion algorithm, road section penalty algorithm and simulation method, are introduced, and then a reasonable path set generation and route rationality judgment index that can be used for dynamic traffic allocation problems are proposed. In a medium-sized road network, the effectiveness and correctness of the proposed algorithm are determined by simulation method, and the results show that the results given by the algorithm based on Dial algorithm, road segment deletion algorithm and road section penalty algorithm are more effective, while the path set bias given by the simulation algorithm is large.