The properties of a detonator were studied by accelerated life test at the conditions of temperature 60 ℃ and 71 ℃,relative humidity 95%. Results show that the changes ocurr on the single function time,mass and the impact sensitivity of inner charge of the detonator，while the resistances have no significant change. The single function time was unqualified when the samples were aged at the condition of temperature 71 ℃,relative humidity 95% for 14 days. The tested sample′s mass was lost more and more and the impact sensitivity of inner charge became more sensitive when the aging time continued.