Elastomeric modified cast double base (EMCDB) propellant was prepared by granule-casting process. The effects of various factors on the curing of EMCDB propellant,such as the resolvability of polymer binder in NG,the reactive activity of curing agent,and the sensitivity of curing reaction to combustion catalyst,were thoroughly studied. By the analysis of the curing mechanism of EMCDB propellant,the reasons for difficult plasticization and resolution of polymer binders in casting granule were found. The results show that the better the resolvability is,the more completely the polymer binder is plasticized and resolved. The low reactive activity of curing agent is advantageous to form perfect cross-linking network. Only those combustion catalysts,which are weakly sensitive to the curing reaction,can be used in EMCDB propellant.