This study aimed to determine the effect of humidification's period toward three levels viability of peanut’s seed which had deteriorated. This research was conducted in the Laboratory of Seed Science and Technology Faculty of Agriculture, Kuala University in Banda Aceh Darussalam, from April to June 2013. This study uses three sets of completely randomized design (CRD) Non Factorial. Factors examined in this study were humidification's period factor consisting of 7 levels and repeated 3 times, so this study has 63 experimental units. The results showed that the peanut seeds that declined 70%, 50% and 30% can increase the value of their viability by way of humidification for 12 hours. Humidification is performed more than 12 hours will adversely affect the value of peanut viability Keyword: Peanut, Humidification, Seed Viability