This study was conducted from March to September 2019 to evaluate the quality of sediment in Bung Binh Thien through the indicators of organic matter, total nitrogen, and total phosphorus by collecting the sediment samples in the outside, inlet, middle, and end areas of the reservoir in the dry and rainy seasons. The findings revealed that the quality of sediment in the area of ​​Bung Binh Thien was spatially and temporally fluctuated. In the dry season, the content of organic matter, total nitrogen, total phosphorus fluctuated respectively from 1.04 to 5.35%; 0.06-0.35% and 0.036-0.076% which were higher than those in the rainy season with the corresponding values were 1.51-4.65%; 0.10-0.28% and 0.042-0.072%, respectively. The nutrients in the sediment inside the reservoir was relatively higher than those in the outside area. There was a strong correlation between total nitrogen, total phosphorus and organic matter in the study area. This partially reflected the impact of living activities and production of the surrounding community on environmental quality in the area of Bung Binh Thien.