To characterize the plants diversity under various protections in the process of vegetation restoration, the plant composition and community characteristic of grassland, abando ned land, artificial closure area, and natural wetland in Yanchi County were analyzed by means of clustering analysis as well as Shannon ) Wiener index, Simpson index, evenness index, and richness index. Results revealed that the wetland in Siertan Nature Reserve had the most biomass and the plant diversity of wetland in Liuyangpu artificial closure area was greater than natural grassland and abandoned land. The vegetation feature and plant divers-ity in 2008 were less than those in 2006 and 2007 for less rainfall and the coverage in 2008 decreased by 50%~ 60%. The biomass in Wuliang dian natural grassland and Siertan wetland decreased by 50%; in abandoned land,about 60%; and in Liuyangpu artificial closure area, about 70%. In 2008, the diversity index of the four land types decreased slightly and the richness index decreased significantly. Compared with 2007, the richness index of artificial closure area on Siertan wetland decreased by 46% and 22% , respectively. Otherw ise, the evenness index of Siertan wetland was seriously affected. It was 0.905 in 2006, while it decreased to 0.836 in 2007and 0.467 in 2008.