To fabricate qualified Ω-shaped composite stringers，this paper formulated the autoclave molding process and mold design scheme for Ω-shaped composite stringers.Adopting the process concept of laying prepregs on the male mold and molding with the female mold，the core problems of Ω-shaped composite stringers was solved， such as the high difficulty in prepreg laying and the inconvenience in demolding.Through using a split metal mold as the outer mold and a flexible non-metallic soft mold as the inner mold， the smooth internal and external surfaces of Ω-shaped composite stringers were obtained while ensuring smooth demolding. Process tests are carried out according to the designed mold and molding process， and products with qualified internal and surface quality are obtained.Meanwhile， it is verified that the autoclave molding process and mold design scheme for Ω-shaped composite stringers are correct and feasible.