16 families,49 genera,87 species of rare and endangered plants in Shegyla Mountains were investigated in this paper.The “coefficient of endangerment” and the “value of superior conservation” were obtained through index quantification and weight allocation,thus the endangered levels and conservation priority classes were determined.The result showed that:(1)Of the 87 species studied,there were 1 critically endangered species,13 endangered species,55 vulnerable species,18 near threatened species;(2)23 species belonged to the first class protection,53 to the second,11 to the third.(3)The endangered level and conservation priority classes varied significantly between our research and the lists of endangered plants,most plants were threatened more severely in Shegyla Mountains.