Stiffened wing panel is easy to lose efficiency due to buckling under the loading of compression, shear, torsion and bend. The concept of stability efficiency factor introduced to carrying efficiency of stiffened composite structures in order to realize optimal design of stiffened composite wing structures. The best design principle that taking the equal of the of the critical buckling load and the static load is adopting. We obtain efficiency factor according to the principle of optimal design and the buckling analysis of stiffened panel, and get the efficiency factor graph through the PCL parametric modeling and analyzing. The research results demonstrate that: the method that building the carrying efficiency of stiffened panel model can rapidly realize the wing structural design and obtain obvious effect of high carrying efficiency.