The first result in this paper is list of natural vegetation types of study area according to UNESCO (1973) with 12 types in 3 classes. The second result is list of species of flora and the diversity of flora, 1553 species belonging to 709 genera, 189 families and 4 divisions of vascular plants were record for the high belt of Hoanglien NP (over 1600m alt.), there are 5 new records for the flora of Vietnam (one monotype families, one monotype genus and 3 other species). Magnoliophyta is most diversity in divisions; 10 richest families and 10 richest genera were list. The third result is about biogeographical elements of plants, special with 20.99% of species is edemic for Vietnam’s flora and 4.46% is local endemic. The lats result is resources of plants, including 656 useful species (42.42%) and 58 species are listed in Vietnam Red data book, IUCN categories, CITES and Vietnam Government Decree 32.