The changes of enlinvar bridgewire resistance and gold bridgewire resistance at different time in accelerated life time test were studied. The conditions of the life test were kept at 50±2 ℃ with relative humidity of 95%±3%. By t-significance level test, means of bridgewire resistance at different life time were analysed. The results show that gold bridgewire resistances have significant changed on 9th day,14th day and 21st day in the life test. However,elinvar bridgewire resistances have no significant changes at different life time.