In Xuan Thuy National Park, the authors recorded 115 species belonging to 101 genera, 41 families of vascular plants (including main mangrove species, associated species, migration species from inland which adapt to natural conditions in Xuan Thuy National Park). There are 10 plant communities in Xuan Thuy National Park, including one artificial Casuarina forest. In this community, dominated species-Casuarina equysetifo/ia was bent over and broken by storm. The individual of communities in alluvial and tidal mud flat was effected by sand invasion. In mangrove communities, timber trees was defoliated, dried and broken top, especially Sonnerafia caseolafa. The authors introduced 5 species as biodiversity indicators for Xuan Thuy National Park.