Ritz energy method is used to establish an analytical model of local buckling problem of axially compressed laminated stiffened composite panels considering the rotational restraint of stiffeners. An improved method of solving the model is proposed considering the influence of the flange attached to skin. Experimental results， FEM results and theoretical results of typical stiffened composite panels are compared and the reasonableness of the proposed analytical method is verified. Results show that the precision of local buckling load is signally increased using the improved method in this paper， and the analytical method can be applied to preliminary local stability design and analysis of stiffened composite panels.