Through the reaction of ethylenediamine (EDA) and derivatives of triazole and imidazole with N,N-dinitrourea (DNU),six energetic ionic salts were prepared. Among them,EDA gave diacidic salt,others derivatives gave monoacidic ones. The effects of solvent,reaction temperature and time on yield of salt from 4-aminotriazole and DNU were analyzed. The yield could be up to 85% in acetonitrile and 71% in ethanol at 10 ℃ for 2 h. Generally,polar solvents with high dielectric constant are beneficial to the salt-forming reaction. The structures of all salts prepared were confirmed and discussed by IR,¹H NMR,¹³C NMR and elemental analysis. The thermal stability of most salts surpasses DNU,for instance,EDA-DNU salt started its decomposition at 125 ℃ (ca. 55 ℃ higher than that of DNU),exhibited the largest mass loss rate at 165 ℃ in TGA curve.