Puxailaileng is an area with the most unique characteristics of biodiversity, with the highest peak in the Truong Son range of 2,711 m, so there are many unique factors here that other regions do not have. With an area of only nearly 50 thousand hectares, the research area has recorded 726 species of higher plants, of which 126 species belong to 28 genera in Nghe An. The endemism is also very high, due to the difference in terrain and climate, there are only 408/726 common species in Nam Can and Na Ngoi communes, 320 species are only found in one of two communes. In the Puxailaileng area, this study has recorded 588 medicinal plant species in 155 families in 5 divisions of vascular plants. Characteristics of diversity of habitat, stem type, collection and diversity of rare and precious species were also assessed, including 27 species listed in the Vietnam's Red Data Book (2007).