In regard to the problems of soil and water loss,environment pollution and the deteriorating self-purification ability of the water body in Three Gorge areas,constructing ecological barriers in the lakeside zone in accordance with regional development mode will provide ecological security and sustain socioeconomic development of the reservoir and the downstream areas.Taken the demonstration area in Panlong town,Yunyang County as an example,the paper discussed functional zoning,and construction target and principles for ecological barrier construction in the lakeside zone,based on field survey on natural conditions and socio economic situations.The preliminary technical system,including over twen-ty constructional modes of nine categories,was proposed.The benefits were analyzed and evaluated in order to provide referential concepts and measures for ecological barrier construction in the surrounding regions of the reservoir.