22/5 days annual UN International Day selected as biodiversity, with the goal of raising public awareness about biodiversity and reflects our responsibility in protecting the precious heritage this for future generations. In 2016, the International Day theme Biodiversity is "Integrating biodiversity; Stable life and community livelihood ". Accordingly, biodiversity is considered the foundation of people's livelihood and sustainable development in all fields of economic activities in agriculture, forestry, fisheries and tourism.
However, in the context of climate change are now increasingly fierce, the extreme weather phenomena (El Nino, La Nina) often occurs not only to the loss of biodiversity but also degrade serious environmental ecosystem directly affects the lives and the development of man on earth. According to the Intergovernmental Panel on Climate Change (IPCC), the biodiversity of natural resources is the most precious and very great role in human life, but humans have overexploited resources this resource makes the ecosystem seriously affected, especially tropical forests shrunk alarmingly way. The degradation of ecosystems, such as deforestation, wetland habitat loss and many species of animals and plants are also degraded you follow, some species are in danger of extinction within the next few decades .
 
Biodiversity of the National Park Phong Nha - Ke Bang highest proven in Vietnam to 2951 plant species belonging to 1,002 genera, 198 them. Of these, 111 species in the Red Book of Vietnam in 2007, 39 species of Decree 32/2006 / ND-CP of the Government. On animals, the results have a statistical study of 825 vertebrate species and 464 invertebrate of 489 varieties, 151 them, 40 sets. In the 25 new animal species were recorded and published worldwide; there are 83 species of rare wild animals listed in Vietnam's Red Book, 110 species listed in the World Red Book. Moreover, with characteristic karst ecosystem, which is the habitat of 10 species of primates, accounting for 50% of all species of primates in Vietnam; Of those, three endangered primates on a global scale as Ha Tinh langurs, langur Douc brown and white-cheeked gibbon. In addition, there exist many natural forest habitat is relatively pristine limestone with the largest area of forest in Vietnam with nearly 71,000, over 90% coverage.