The purpose of this study is to analyze plates with Composite materials. so as to achieve this aim, in this study, homogenization method is adopted and supplement calculation program(H-Gen) is coded to easy access this method's results. Using the result, finite element analysis for plate's eigenvalues is performed and then it is compared to full 3d analysis. The results of this study are as follows; homogenization method is good choice to modelling composite material's properties and developed program is useful of analysing plates with composite materials. but the result has restriction because mixing process of composite materials is various. so succeeding study on this point of view is demanded.