Abstract: Kayasenegalensis (Desr) A. juss, locally known as Mahogany , is one of the most economically important forest tree species in Sudan .The seeds of this species have polymorphism phenomenon and dormancy mechanism. Therefore the objective of this study is to determine feasible and practical seed dormancy – breaking method as reflected uniform germination in order to select the method have high rate of germination for forestation and conservation purpose . .The study was carried out on seeds that selected from three localities (Sinnar, Southern Kordofan and Southern Darfur States). Sudan. The germination was examined using three interval of water soaking (12hr, 18hrsand24hrs) and three different concenrration of Gibberellic acid (0.01con, 0.001con, and0.0001con) under controlled environmental conditions in germination chamber. Result revealed significance differences between the three localities on seed attributes, Seeds of Mahogany also showed large and small sizes which are deeply dormant .and presence of a combined dormancy (Chemical and endogenous). In conclusion soaking in H2O for 18 hrs and GA3 (0.01 cons) for two hours are the best treatments to break seed dormancy.