A study on the adaptation of improved varieties of rice was carried out in ISEA Bokonzi experimental site in Kungu territory, Sud Ubangi province (Democratic Republic of the Congo). The main objective of the study was to evaluate the adaptation of these three improved varieties (IRAT 112, NERICA 7 and NERICA 4) in the territory of diffusing. The results showed no significant differences between them and all varieties were well adapted in the ecological conditions of the experimental site. However, in the harvest, NERICA 7 revealed a great yield of rice in husk.