Research on the Ecological Assessment Pencil Orchid (Vanda hookeriana Rchb.) in Lakes Dusun Besar Nature Reserve held on February to December 2013. This study is located in the region of Nature Reserve Bengkulu. This study used purposive sampling techniques in site selection and using 2 m x 2 m plot for sampling. The results are found that orchid pencils are very rare nowadays. Orchids are found generally still yet flowering buds. In the research that has been carried out it was concluded that the Important Value Index (INP) of Vanda hookeriana is the lowest one is 19.65 % while the highest INP value is Imperata sp. (Graminae) 78.60 %. Besides, the population of Vanda host is the daffodil (bakung putih) also considered well too. Vanda is an epifit organism, it really need host to grow up. Vanda hookeriana life depends on ecological factors such as temperature, humidity, sunlight penetration and the pH of the water. The low value of INP Vanda hookeriana is because the flower rare. The flower is hunted by people because it is a very commercial nature orchid in the world oforchid lovers. Related to preserv of the orchidin their natural habitats, it’s really need the government enforcing the new regulation about the orchid preservation. It also consider to conserve as the Vanda’s host.
Keywords : endemic orchid, Vanda hookeriana, Bengkulu Nature Reserve, endanger orchid