This research analyses factors that influence the adoption of combination of improved groundnut seed, inorganic fertilizer, and organic fertilizer in eastern Ethiopia using a cross sectional data collected from 300 sample groundnut farming households. Multivariate probit and ordered probit models are used to identify factors affecting adoption of multiple technologies. Tobit model is used to spot the determinants of intensity of adoption of improved seed. The results show a strong correlation between improved seed and inorganic fertilizer adoption, indicating the simultaneous adoption decision of farmers. Age of the household head negatively affects the adoption decision of improved seed while education, groundnut farming experience, extension contact, training and plot size are positive contributors.