随着存量设计时代的到来,旧城更新成为我国未来城市建设的主旋律。本文结合轨道交通这一城市建设的重大契机,从城市触媒的角度,分析轨道交通给旧城更新带来的触媒元素及触媒机制,探索如何有效引导轨道交通的触媒反应,形成自下而上的有机式更新。 With the arrival of the stock design era, the renovation of the old city has become the main theme of the future urban construction in our country. In this paper, with the great opportunity of urban construction of rail transit, this paper analyzes the catalyst elements and catalyst mechanism brought by rail transit to the renewal of the old city from the perspective of urban catalyst and explores how to effectively guide the catalyst reaction of rail transit to form a bottom-up Organic update.