Long term use of lead azide and lead styphnate as primary explosives has resulted in lead contamination. Substantial synthetic efforts have long been focused on search for greener primary explosives. Some series of tetrazoles which could be used as primary explosives are reviewed,and their properties are described. Copper(Ⅰ) nitrotetrazolate and some series of 5-nitrotetrazolato-N²-ferrate hierarchies which do not pose health risks to mankind and cause much less pollution to the environment are interesting, and they might be suitable to replace lead primary explosives.