The large thin-wall curved surface composite parts are mostly formed by autoclave process，which will cause deformation in the curing process and demoulding process，resulting in deformation out-of-tolerance and assembly difficulty. In order to solve this problem， this paper firstly used the path-dependent constitutive model to analyze the curing process， then carried on the autoclave molding test to verify the theoretical analysis results， and finally used the reverse compensation method to correct the mold surface according to the theoretical analysis results. The simulation results show that the maximum displacement and minimum displacement of a large thin-wall surface composite parts after forming are 11.121mm and 0.171mm， respectively， which occur at the corner points of the short side and the corner points near the short side of the symmetry axis.The residual stress of the parts is larger on the two sides and the short side of the larger deformation， which is about 7MPa different from the long side of the smaller deformation. The simulation results are in good agreement with the experimental results， and the average curing deformation error is 8.6%. The maximum curing deformation of the part was reduced by 70.8% when the compensated mold was used for curing deformation simulation again.