Abstract: A toughened epoxy resin matrix is designed for the wet-winding of a carbon fiber composite solid rocket motor case, under the consideration of the relations among viscosity, mechanical and heat-resistance properties.The curing kinetic parameter, gel time and properties of casting parts and carbon fiber composite are studied by means of DSC, FT-IR, ect. The results showed that the formulation of the toughened epoxy resin matrix has low viscosity, longer-life-time and higher toughness, the matrix has strong interfacial adhesion with the carbon fiber, and the strength conversion ratio of the carbon fiber is high.