This research focused on detecting the specific composition, the ecology and the chorology of Dipterocarpaceae species in Cat Tien National Park forest. The result revealed that fifteen taxons include thirteen species, one subspecies and one variety belong to this taxons Hopea recopei Pierre and Dipterocarpus tuberculatus Roxb. var. grandifolius (Teijsm. ex Miq.) Craib were found in Cat Tien the first time. 14 of 15 taxons of family Dipterocarpaceae found here were in IUCN list 2009 and 2 taxons in Vietnam Red List 2007. Species of Dipterocarpaceae in Cat Tien National Park distribute at three main habitats: the dense evergreen forest, the dense semi-evergreen forest and the lowland forest flooded short time in rainy season. Most of Dipterocarpaceae plants distribute at low to mid altitude with thick, moist soil. However some of them are well xerophilous plants. In Cat Tien, Dipterocarpaceae plants are most presented at South of Cat Tien, especially East and South-East areas. On contrast, at North area - Cat Loc, they are presented with scattered inviduals. The distribution coordinate of Dipterocarpaceae species were marked on Cat Tien National Park's digital map.