Aiming to resolve the technical matters such as uneven pressure on products, pits on the panel, improvement of the inner quality, based on the analysis of co-curing method, the T shape stiffened panels were researched in this paper. The match condition, process parameters and orientation of the stringer are analyzed and optimized. The fabrication process of T shape stiffened panels and technical details are improved. The results show that the test product quality is excellent, the product inner is compact, the surface is smooth and the stringer axis is accurate.