In order to make urban wisdom grow, policymakers often face a challenging problem, that is, how to carry out the commercial land layout based on the performance of the transportation system, so as tocoordinate the development of transportation and land use. The invention provides a novel two-layer model system to solve the problem, wherein, the upper layer model optimizes the performance of the traffic system through the layout of the commercial land, and the lower layer realizes the traffic system equilibrium through the sequential model with feedback, wherein the upper layer model optimizesthe performance of the traffic system through the layout of the commercial land. In addition, the polynomial logit model is applied to the traffic distribution to fully represent the traveler's decision-making behavior. In order to solve the proposed two-layer model, the present invention is based on Dirichlet distribution, iterative weighting method (MSA), Frank-Wolfe algorithm and Dijkstra algorithm, an efficient Dirichlet assignment algorithm is designed. Finally, Nguyen-Dupuis network is used to validate the feasibility and effectiveness of the proposed method and algorithm. The modelingmethod can be used as a valuable tool to determine the layout of urban commercial land.