As a kind of typical aquatic-terrestrial ecotone,riparian zone has very important ecological,economic,and social values,whereas landuse has a major impact on ecological environment of riparian zone.Exemplified with buffer zone around Baiguishan Reservoir in Pingdingshan City,an evaluation index system indicating the impacts of landuse on ecological environment was formed in view of landuse type.Remote sensing techniques were adopted to acquire landuse information,expert marking method was used for index quantification,and AHP method was adopted for index weight determination.Evaluation results show that landuse has a moderate negative influence on ecological environment of buffer zone around Baiguishan Reservoir.Impacts of landuse on ecological environment in different divisions of buffer zone are different.The order of the three divisions is No.1No.2No.3,among which division No.1 has a greater impact,division No.2 has a moderate impact,and division No.3 has a light impact.The landuse types having greater impacts on ecological environment in the buffer zone are the urban construction land,orchard and vegetable land,and forest and grassland,as well as industrial and mining lands.