Under the standard condition (ratio of chamber pressure to exit pressure (p_c:p_e) is 70/1), the energy parameters of HTPB and CMDB propellants containing hydroxylammonium 2-dinitromethyl-5-nitrotetrazole (HADNMNT) were calculated by minimum free energy method. The density impulse of the HADNMNT monopropellant is 4936.4 N·s·cm^-3, which is higher to that of the RDX and lower to HMX and CL-20. Replacing AP with HADNMNT in HTPB propellant can increase specific impulse by 428.7 N·s·kg^-1. The iso-impulse trigonal figure of the HTPB propellant is drawn out, and the relationship between specific impulse and ingredients was discovered. The impulse of HTPB propellant is up to 2778.9 N·s·kg^-1, when the mass fractions of HTPB, HADNMNT, RDX and Al powder are 10%, 60%-62%, 14%-16% and 14%-15%, respectively. Replacing RDX with HADNMNT in smokeless CMDB propellant, the specific impulse increases to 2522.9 N·s·kg^-1. Moreover, the specific impulse of CMDB propellant can be remarkably improved through adjusting the mass fractions of HADNMNT and Al powder. The impulse of CMDB propellant reaches 2598.5 N·s·kg^-1, when the mass fractions of NC, NG, HADNMNT, Al, DINA and Al powder are 25%, 33%, 11%, 20%, 3.5% and 7.5%, respectively.