Ecological and potential study of ramin was conducted in September 2002. Sampling plot of 20 meters x 1,000 meters with distance between plots was 1 km with total transect of three. Observation within the transect were on stage of tree, pole, sapling and seedling measured. Predominant species were Gluta renghas, Kingiodendron sp., and Shorea spp. The tree stages of ramin was 1.48 tree/ha, poles stage 33.75 individual/ ha, sapling stage 125 individual/ha, and seedling stage 468.75 individual/ha. Ramin was closely related to Kingiodendron sp., G. renghas, and Mezzettia parviflora. However, this species did not associate with Litsea sp., Dryobalanops abnormis, and Canarium caudatum. The habitat of ramin was peat swamp forest with the depth of more than 3 m and influenced by tide but the water remain unsalted.