This study was conducted in Dong Nai province's Tan Phu broadleaved evergreen forest, aiming to understand better the ecological characteristics of Shorea roxburghii - an IUCN's Red List plant. For data collection, a 2 ha-standard square (100×200 m) was established in the stand where S. roxburghii is distributed. Relative density, relative basal area, and importance value index were determined for each species; all individual trees of the standard square were also divided by life-history stages (juvenile, sub-adult, and adult). The collected data were analyzed by using R v4.1.1 software. A total of 100 species belonging to 49 families were identified. The highest was the relative density, basal area, and importance value index of S. roxburghii; however, its breast height diameter was only average compared to the main 16 species in the standard square. The spatial pattern of S. roxburghii was aggregation at the juvenile tree stage and randomness at the sub-adult and adult tree stages. In the spatial association patterns of S. roxburghii and the main 16 species of the standard square, S. roxburghii had an attraction pattern with five species, a repulsion pattern with four species, and an independent pattern with seven other species.