3, 7, 10-Trioxo-2, 4, 6, 8, 9, 11-hexabenzyl-2, 4, 6, 8, 9, 11-hexaaza[3, 3, 3]propellane (HBPTO) is a key intermediate of synthesizing high energetic density material 2, 4, 6, 8, 9, 11-hexanitro-2, 4, 6, 8, 9, 11-hexaaza[3, 3, 3]propellane.Target compound HBPTO was synthesized via oxidation, addition, condensation and substitution using uric acid (UC) and potassium ferricyanide as initial materials with an overall yield of 8.58%.Its structure was characterized by ¹H NMR, ¹³C NMR, FT-IR, MS and elemental analysis.The reaction mechanism of synthesizing intermediate glycoluril diamine (DAGU) was discussed and its microscopic reaction process was revealed.The process conditions of synthesizing DAGU was optimized.The synthetic process of 3, 7, 10-trioxo-2, 4, 6, 8, 9, 11-hexaaza[3, 3, 3]propellane(PTO) was improved.A new method of synthesizing PTO via an one-step condensation reaction of DAGU and N, N′-carbonyldiimidazole(CDI) was self-designed.Results show that the optimized process conditions of synthesizing DAGU are: n(UC):n(K₃Fe(CN)₃)=1:4.2; reaction temperature of 25 ℃ and reaction time of 0.5 h.