The conservation of GO，NO-GO Method in GJB 376-87 "Assessment Method of Reliability for Initiating Devices" and the Bayes method of reliability for initiating devices were discussed in the paper. A new GO，NO-GO Method was designed to estimate reliability of initiating devices with less sample-amount. It was deduced using statistical theory and mathematical methods. The Bayes, the new proposed and classical estimation methods were compared experimentally. The results show that the former two exhibit better reliability estimation for initiating devices than the classical estimation, and the new method requires less sample-amount than the other two.