Abstract：Based on the modern structural design requirement and the overpowering need of reducing structural weight，the major research work in this thesis includes building up the structural geometrical model by CATIA CPD mould of composite RTM Waved-beams with large size and complex thickness area,optimizing the ply stacking sequence of composite laminates by coding Fortran program，implementing the Waved-beams test,the Waved-beams has been successfully applied and meets the need of reducing structural weight 。