Composites will have curing spring back deformation resulting in dimensional changes due to unavoidable physical and chemical mechanisms which take place during the autoclave curing process. V-shaped composites are widely used in the outer surface of the aircrafe, therefore it is essential to study the deformation mechanisms of the curing process for improving composites molding precision and effectively reducing the difficulty of assembly. This paper establishes the finite element analysis model and design the typical structure sample in order to analyse the influence of mold forming method on the curing deformation of V-shaped composites.The results show that the deformation between the predicition and the sample is in the range of 5%, and the deformation of the male mold forming is 10%~15% larger than that of the female mold forming.The deformation springback is inversely proportional to the corner angle and the thickness of the workpiece, when the male mold forming and its spring back angle is proportional to the radius of the coener.