A study on buckling analysis of the ship deck plate specimens, made of composite materials is presented. Certain deck plate specimens, of various thicknesses, so in the case of perfect manufacturing and in the case of existing imperfections are analysed. The analysis is based so on the analytical determination of the critical buckling load of perfect molding composite, and on the finite element modeling, made by licensed soft COSMOS/M. Analysis was made using various element types and meshes.