Bridge engineering activities are referred to as a series of activities in order to achieve some specific purposes,i.e.,the interactions by human beings with the peripheral ecosystem in the process of bridge design,construction and operative maintenance.This paper analyzed the effects of the bridge engineering activities on ecosystem processes.From physical,chemical,biological and social perspectives,the ecological effects of bridge engineering activities were addressed.A philosophy of ecologization was then proposed for bridge engineering activities.Furthermore,ecologization strategies were discussed specifically for the design,construction and operative maintenance phases in bridge engineering activities.In summary,the purposes of bridge projects should be not only to meet social needs,but also to satisfy the requirements for the healthy and sustainable ecosystem.