刘家峡水库是我国西北地区黄河上游的大水库工程之一,以发电为主,兼有防洪灌溉等,其环境影响问题日益为人们所关注.本文是在对水库周围植物现状考察和回顾调查的基础上.对建库前后植物群落分布和区系组成进行了对比分析,并对其时空变化规律及成因进行了初步探讨. Liujiaxia Reservoir is one of the major reservoirs in the upper reaches of the Yellow River in the northwest of China, and is mainly concerned with power generation and flood control irrigation, and its environmental impact is increasingly concerned by people.This paper is based on a survey and review of plant status quo around the reservoir The comparison of plant community distribution and fauna composition before and after the establishment of the reservoir was carried out, and the temporal and spatial variation and genesis of the plant community were discussed.