Copper（Ⅰ） 5-Nitrotetrazolate （DBX-1） is a green primary explosive without toxic heavy metal， which has been always attracted much attention since its discovery. DBX-1 is considered to be the most likely to replace lead azide （LA） as a result of its suitable ignition sensitivity， excellent detonation ability and output ability， good compatibility and temperature resistance. Sodium 5-nitrotetrazolium （5-NaNT） is the starting material for the preparation of DBX-1. This work addresses the synthesis problems of 5-NaNT based upon the review on the research progress of DBX-1. This work introduces both the development process of DBX-1 from laboratory synthesis to 100-gram preparation and the synthetic path evolution of 5-NaNT. Here is mainly focused on the synthesis method， performance evaluation and verification of DBX-1.Finally， it points out that some key issues must be cracked before application， such as the synthesis of 5-NaNT with safety and efficiency， the optimal technology of preparation， the sensitivity adjustment of DBX-1.