The effect of CL-20, AP, Al power and combustion catalyst on combustion properties （burning rate and pressure exponent）of CL-20-NEPE propellant was studied with designed formulation ［NB(PEG/NG/N-100/C₂),NB/CL-20,NB/CL-20/AP,NB/CL-20/AP/Al,NB/CL-20/AP/Al/Ct］ , in which the ingredients are added one by one, and compared with that of RDX-NEPE propellant. The results show that the substitution of CL-20 for RDX in RDX-NEPE propellant increases the burning rate, but the pressure exponent of CL-20-NEPE propellant which is difficult to reduce is larger than that of RDX(HMX)-NEPE propellant.The burning rate of AP-NEPE propellant containing 70% AP reveals a plateau at 4-10MPa. Adding AP into CL-20(RDX)-NEPE propellant increases the oxygen coefficient and the burning rate, and decreases the pressure exponent. Addition of Al powder increases the burning rate of RDX-NEPE propellant although has little effect on that of CL-20 NEPE propellant. The pressure exponent of burning rate of CL-20-NEPE propellant is decreased by combustion catalyst PbCO₃ and Pb(NTO)₂·H₂O.