Soybean (Glycine max L. Merrill) seeds of Santa Rosa and Víçoja cultivars were treated with Homai (Thiophanate-methyl 50% + Thiram 30%) and (Thiram 50%), prior to storage during six months, under two conditions: dry chamber (35% R.H.) and normal environment of the Seed La boratory of the Agriculture and Horticulture Department of "Escola Superior de Agricultura "Luiz de Queiroz", University of São Paulo, Brazil. Seed quality was evaluated at three - month interval by means the standard germination, first-count, accelerated aging an seedling emergence. It was found that fungicide treatment can be used to protect seed performance during storage, but better knowledge of Seed Pathology is necessary of accurate informations.