Aiming at the phenomenon of data "hanging upside down" in the storage test of initiating explosive device, a storage reliability evaluation method of initiating explosive device based on dynamic distribution parameters is proposed. The prior information of the "upside-down" test data was obtained by using the reliable test data points, and the "upside-down" test data was corrected by using the Bayes theory. Based on the corrected test data of the initiating explosive device, the storage reliability degradation model was established, and the storage life of the initiating explosive device was obtained. The results show that the storage life of initiating explosive device is more reliable.