The preliminary results show that the diversity of vascular plants in Bach Long Vy island is low. There are 7 types of plant communities, with 281 species, 1 subspecies and 7 variations belonging to 229 genera, 111 families of Polypodiophyta, Gymnospermae and Angiospermae, to which most species belong. The report records introduced, rare and endangered species. Among them, 104 species are non-native, 1 is recorded in Vietnam Red Data Book (2007), 3 are listed in the annexes IA or IIA of The Government Decree No.32/2006/ND-CP, and 17 species are indexed in Red List of Threatened plants, IUCN (2011).