In this paper, the data of flora and it's biodiversity the Yokdon National Park have been update in 2004 with 854 species, belong to 478 genera and 129 families of 4 phyla of vascular plants. Thus, 288 species belonging to 188 genera, 21 families and 1 phyllum were added in. Some species of them are characteristic for West Central area, such as Sellaginella deliculata, Nepenthes geoffrayi, Dendrobium langbianensis… The new data of plant resources of Yokdon NP's flora are 375 species including 249 medicinal species, 42 species for timber and 42 ones for foods, foodstuffs and others for ornamental, Medical piosonous, essentional oil. 17 species of this flora were record in IUCN categories and 22 species were record in Vietnamese Red data book. Thus, we added 11 species in this flora from Vietnames Red data book.