In order to improve the mechanical property of combustible cartridge case and adapt the feature of unit cartridge case charge, a kind of new combustible cartridge case(NCCC) was designed and manufactured. The mechanical property and combustion performance of NCCC and suction molding combustible cartridge case(SMCCC) were studied by experiment measurement. The burning-off property of NCCC in mixed charge with main charge was analyzed. Results show that compared with SMCCC, the tensile strength of NCCC increases from 32.68 MPa to 94.18 MPa and the compressive strength increases from 7.79 MPa to 11.78 MPa, revealing that its mechanical properties are significantly improved. But NCCC exists about 8ms ignition delay phenomenon and the pressure rises slowly, the burning rate is low in combustion process. When the percentage of NCCC is from 0% to 60% in mixed charge composed of NCCC and AGu-15 7/7H, the combustion residues in closed bomb are mainly from AGu-15 7/7H. The ballistic test of NCCC charge shows that it can meet the requirements of ballistic performance of unit cartridge case charge.