In order to explore a new route for the synthesis of CL-20,hexaallylhexaazaisowurtzitane was synthesized by condensation reaction of allylamine with aqueous glyoxal without inert gases protection. Its structure was characterized by FTIR,¹H NMR and ¹³C NMR. This route has higher yield of 37.1% and easier way than the literature. Hexaallylhexaazaisowurtzitane without benzyl group in the molecule would be a potential nitrolyzable precursor to CL-20.