中文摘要：

合理的特许价格是城市交通基础设施PPP项目健康可持续发展的关键，仅从私营机构角度考虑投资者利益对特许价格进行调整缺乏科学性。鉴于此，文章从利益相关者多方满意角度，选取了城市交通基础设施PPP项目特许价格调整影响因素，利用遗传算法和神经网络优势互补原理构建了特许价格调整模型，并运用该模型对某城市地铁PPP项目特许价格调整进行了实证研究，结论表明基于利益相关者多方满意的遗传优化改进型BP网络模型计算的特许价格调整结果精度较高，该方法科学合理可行。

英文摘要：

Reasonable concession-price is critical for the healthy and sustainable development of urban trans- portation infrastructure project （UTIP） under Public-private partnership （PPP） model. Instead of considering only the private investor＇ s interests, all stakeholders＇ interests should be taken into consideration in the determination of concession price. Therefore, some influential factors for the concession-price adjustment of UTIP under PPP model are selected and a concession-price adjustment model applying GA-BP method is established, which is an improve- ment to the BP neural network method using genetic algorithms so as to make full use of their advantages of respec- tive method. The relevant empirical research is carried out for a subway project in a city and with the conclusion that this new concession-price adjustment model improves the precision of the result of calculation and therefore is more scientific, reasonable and feasible.