By using analytical and finite element methods, three structural forms of the missile strake wing splint were analysed and contrasted. The stress characteristics and bearing capacity of three kinds of splint was obtained. Basing on this, finite element method was used to simulate and compare the mechanical performance of different types of splint when used in combination, then the stress distribution law of each group of splints was obtained. And a better combination scheme was recommended. At last, optimal design of splint thickness was carried out. This study provided reference for splint structural design.