A new green primary explosive copper (Ⅰ) nitrotetrazolate (CuNT) was synthesized from cuprous chloride,sodium 5-nitrotetrazolate,etc. The synthesis process was studied through single factor experiment. The results show that CuNT is of good free-running property,hygroscopicity and thermal stability. The compound is insensitive to impact,flame and static discharge. Also,the minimum quantity experiment shows that the CuNT has a fairly high explosion capacity that only 20 mg could detonate the RDX. In some initiating devices,CuNT may be a substitute for Pb(N₃)₂ and lead styphnate.