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国内外对交通枢纽选址问题的相关研究已经有很多，但是在传统选址模型中很少考虑到枢纽所在城市的经济影响力因素. 本文通过研究经济圈城市经济发展与交通枢纽选址的内在关系，在以运输成本和枢纽建设成本最小的传统选址模型基础上，引入影响经济圈城市经济发展水平的6种因素，以经济圈交通枢纽所在城市的经济影响力最大，并考虑路网上交通流量的均衡分配，建立了经济圈交通枢纽选址双层规划模型. 为了快速对模型求解，提出了一种基于小生境遗传退火算法，该算法易于编程，实用性较强. 最后以长三角经济圈内交通枢纽选址作为算例，说明了该方法有效可行.

Location Model of Transport Junction in Economic Circle and Its Algorithm

Transport junction location problem has been a lot of relevant research at home and abroad, but the traditional location model rarely has taken into account the economic influence factor of the cites where the transport junction was located. On the basis of analyzing the internal relation between economic development of cities and transport junction in the economic circle, this paper introduced the six factors that influenced economic development level of cities in the economic circle and developed a Bi-Level programming modal with the minimization of the transportation costs and the junction construction costs, the maximization of economic influence of the cities where the junction was located, and considering the traffic equilibrium on the roads in economic circle. Hybrid niche genetic simulated annealing algorithm was proposed for solving the model quickly, which was programmable and practicability. Thereafter, the validity and practicability of the proposed model were demonstrated by the example of transport junction location in the economic circle of Yangtze River Delta.