In order to regulate the rheological properties of cast smokeless composite modified double based (CMDB) propellants composed of nitrocellulose, nitroglycerin and clotrimethylene-trinitramine, the influences of plasticizer, rheological modifier and temperature on the rheological properties of cast CMDB propellants were studied by a HAAKE rotational viscometer. The results show that CMDB propellants are pseudoplastic fluid with yield stress. By adjusting the ratio between plasticizer nitroglycerin and DINA (m(NG):m(DINA)=10:1, 8:1, 6:1), with specific plasticizer reduces, the viscosity and yield of CMDB propellants increase and the flow activation energy decreases. With the increasing in rheological modifier content, the viscosity of CMDB propellants increases obviously, and the flow activation energy decreases. The viscosity of CMDB propellants decreases at higher temperatures.