The diversity of Ficus (Moraceae) was conducted at Khao Ang Reu Nai Wildlife Sanctuary during 2003. Line transects were used for monitoring in which ten line transects were established and each line extended 10 km. Recensus was done every month which species and site distribution including environmental data were recorded. The result showed that 39 Ficus species were founded, representing all subgenera; Urostigma with 17 species; Pharmacosycea with 5 species; Sycomorus with 5 species; Ficus with 2 species; Synoecia with 5 species and Sycidium with 5 species.