The study of population and distribution of saninten (Castanopsis argentea (Bl.) A.DC) seedling was conducted in August 2003 at block Pasarean, Cibodas Resort, Gede Pangrango National Park. The square inventory of 20 plots sizing at 2 x 2 m for seedling level and 20 x 20 m for tree level. Regeneration analysis were laid down at 1,300, 1,400, 1,500, 1,600, and 1,700 m asl. The research showed that the species composition of seedling communities at 1,300 and 1,600 m asl was kileho (Saurauia pendula Bl.), at 1,400 and 1,700 m asl was huru (Litsea sp.) and at 1,500 m asl was nangsi (Villebrunea sp.). The highest density distribution of tree and seedling stage of saninten were at 1,400 m asl which were 18 trees/ha and 833 seedlings/ha with dominance index of 0.06. While the highest of species diversity index occured at 1,300 m asl about 3.34 with 35 invidual species. More over, based on altitudinal sites, the value of index similarity was occured between 1,600 m asl and 1,700 m asl was 65.24%.