1 Introduction In the last decades,the furazan fused ring compounds have been paid much more attention owing to their characteristics,such as high density,high specific volume and high nitrogen content[1-3].A novel energetic compound based on furazan fused ring,6-nitroimino-4,8-dinitro-5,6,7,8-tetrahydro-4H-imidazo [4,5-e] furazano [3,4-b] pyrazine (NIFDNP),was firstly designed and its properties of physicochemical and detonation were calculated by Gaussian 09 program[4] and VLW method[5].Using glyoxal and nitroguanidine as starting materials,NIFDNP was synthesized for the first time via the reactions of twice cyclizations and nitrification with atotal yield of 14.3％ (Scheme 1),NIFDNP and its intermediates were characterized by the means of NMR,IR,MS and EA etc.Furthermore,its melting point was tested by melting point apparatus.