Abstract: There are 563 species of wild seed plant in Huangzangyu Nature Reserve,which belong to 328 genera,90 families.Based on the analysis of families, genera and species ,the characteristics of flora are summarized as follows:(1) The flora has a obvious character of temperate zone;(2) The floristic diversity is revealed by small and monospecific taxa as the main components;(3)The flora represents a transitional pattern of distribution from temperate to N.subtropic.Based on the 24 releves, the forest vegetation is divided into 1 vegetation type,7 formations. Each of formations is described in detail.