The enthalpies of formation for energetic polyurethane binder using glycidyl azide polymer (GAP), poly glycidyl nitrate (PGN), poly bis-azidomethyl oxetane (PBAMO), poly (3-nitratomethyl-3-methoxetane (PNIMMO) as polyether glycol, diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), isophorone diisocyanate (IPDI) as polyisocyanate were calculated by group additivity method. The energy parameters of the designed propellant formulations based on hexogen(RDX), hexanitrohexaazaisowurtaitane(HNIW), 1, 3, 3-trinitroazetidine(TNAZ), 3, 4-dinitrofurazanofuroxan(DNTF) were calculated by inner energy method.Simutaneously, iso-force content triangular plot of 1250, 1300, 1350 kJ·kg^-1 for (MDI/GAP₁₀₀₀)/RDX/HNIW, (MDI/GAP₁₀₀₀)/RDX/TNAZ and (MDI/GAP₁₀₀₀)/RDX/DNTF formulations were drawn. Results show the enthalpies of formation of polyurethane binder can be calculated by structure units. The formulations containing solid filler and energetic binder have high force content. The force content of formulations with 30%~50% solid filler could exceed 1300 kJ·kg^-1. The force content presents linear cariation trend when replacing RDX using HNIW, TNAZ, but when adding DNTF in formulations, there is a transition point on the iso-force line. The calculation results of (MDI/GAP₁₀₀₀)/RDX/TNAZ formulations indicat that the formulations could reach the international advanced level (force content higher than 1300 kJ·kg^-1, explosion temperature lower than 3300 K).