Resin transfer moulding(RTM) technology can be used to realize high surface quality and net size moulding of composite force-bearing components.Composite skirt of solid rocket motor case was prepared by RTM process using formula A that resin is as matrix and 3K satin carbon cloth as reinforcement material.The RTM process characteristics of A formula and the properties of resin castable were analyzed,the injection mould and equipment for composite skirt were introduced,the RTM process parameters and the properties of composite skirt materials were discussed.The results show that the fiber volume fraction of composite skirt reached 54.5%.Under combined load（axial compression +bending moment），the axial compression reaches 748 kN and the bending moment reaches 94N·m, pure axial compression load reaches 1 062 kN,pure bending moment load reaches 143.1 N·m.High strength of shell composite skirt meets the design and application repuirements.