The energy characteristics of high energy solid propellants based on the block copolymer (BAMO/AMMO) of 3, 3′-bis (azidomethyl) oxetane (BAMO) and 3-azidomethyl-3-methyloxetane(AMMO) (BAMO/AMMO) as binder were calculated by "Energy Calculation Star (ECS)" code. The influence of different plasticizers (diazidopentane (DIANP), glucidyl azide polymer (GAP) and butyl nitrooxy ethyl nitramine (BuNENA)), oxidants (ammonium perchlorate(AP), hexanitroxaazasowurtzitane(CL-20), furazan compounds(3, 4-dinitrofurazanfuroxan(DNTF), dinitroazodifuroxan(DNAF) and diazidoazofuroxan(DAAOF)), and high energy fuels (aluminium (Al) powder and aluminum trihydride (AlH₃)) on the energy characteristic parameters(specific impulse(I _sp), combustion temperature (T_c) and oxygen coefficient (φ), etc.) of BAMO/AMMO based propellants were studied. Results show that I _sp of propellant plasticized with Bu-NENA is greater than that of BAMO/AMMO based propellants plasticized by DIANP or GAP. With replacing AP by CL-20 gradually in propellant plasticized by Bu-NENA, the T_c of BAMO/AMMO/BuNENA based propellant shows a trend of increase early and decrease then. When the content of CL-20 is more than 55%, the I _sp of propellant remains the same and increases to maximum. When AP was replaced by CL-20 entirely, the value of I _sp is declined. The substitution of DNAF for CL-20 makes the I _sp of propellant enhance from 2723.71 N·s·kg^-1 to 2798.00 N·s·kg^-1. When Al powder and CL-20 are replaced by AlH₃ and the value of φ of system is increased, the energy of propellant is sharply increased.