Stream buffer strips are located between the terrestrial ecosystem and the aquatic ecosystem,which are also the important composition of stream ecosystem.This paper emphasizes the introduction of six ecological functions of buffer strips,that is,species heaven,nutrient source,river bank stabilization,water quality amelioration, landscape value and harmful impact alleviation.However,disturbances caused by human activities to stream buffer strips become serious due to a great increment in the land for construction and transportation.Therefore,there is an urgent need in scientific rehabilitation and management.For this reason,we present three basic principles of scientific management of stream buffer strips as the guidelines for the rehabilitation and construction of stream buffer strips in different grades in different areas.By taking the Nansha River located in Haidian district of Beijing for an example,we illustrate the functions of stream buffer strips and the scientific management principles.