Due to the ever increasing gap between the need of infrastructure facilities and the availability of public budgets worldwide BOT/ PPP models became a procurement alternative of public infrastructure providers during the last15 years.

• 由于公共财政预算与基础设施建设之间的资金缺口日益扩大，过去十五年以来，bot/PP模式已成为公共基础设施建设的另一种方式。