With the increased investments in infrastructure in China

tunnel construction is strengthened

its technology is improved

and its scale is increasingly large.These have some significant influences on ecological environment at the same time.The connotation of tunnel project and its effects on ecosystem are discussed and the effects of tunnel project

including physical effect

chemical effect

biological effect

and social effect

are analyzed.Ecological tunnel project is a logical choice to maintain ecosystem health.Ecological strategies of tunnel project are discussed from the aspects of survey and design

construction

and benefit operation.Ecological tunnel project can alleviate the interference and damages to structure and functions of ecosystem and the threats to ecosystem health.This study may provide some references to the coordination of tunnel construction with environmental protection.