Achieving national food security and diversifying export earnings from agricultural products is one of the major challenges currently facing developing countries like Ethiopia. Pulse crops in general and soya bean in particular play great role in improving households' food security, increasing income for smallholder farmers. Despite the high production potential and the economic importance of the crop, adoption and dissemination of improved soya bean varieties is constrained by various factors. Therefore, this study aimed at identifying determinants of adoption and intensity of adoption of improved soya bean varieties. The study was based on cross sectional data collected from 146 randomly selected soya bean producing farmers. Descriptive and econometric analyses were used to analyze data. The result showed that sex of household, education level, training, distance to nearest market, participation on off-farm activities and TLU affected the probability of adoption while education, farm experience, training, distance to nearest market and TLU affected the intensity adoption of improved soya bean varieties significantly. This study suggests that the high importance of institutional and government support in the areas of education, training, infrastructural development (especially roads). Therefore, policy and development interventions should give emphasis to the improvement of such institutional support system and decrease gender disparities in access to such institutions so as to achieve the adoption practice which increases production and productivity of small scale farmers.