Dongzhai Port National Nature Reserve belongs to the mangrove marsh wetlands in the offshore and coastal wetland types, and the main protection objects are mangrove forests and water birds. The area is growing in the largest area, complete variety and most complete mangrove forest in the country, a total of 16 species of mangrove plants 32 species, of which water coconut, red lan li, sea mulberry, egg leaf mulberry, mulberry, wood fruit mulberry, Zheng mangrove, pointed leaf halogen mulberry are precious tree species. Hainan mulberry and spiky halogen are unique to Hainan.