Abstract: The analysis model used for calculation of thermal stress in FGM is estab-lisd based on, The classical lamination theory and thermal-elastic mechanics with five assumptions. The distributions of temperature and thermal stress in FGM under steady state temperatue field are derived. By means of FGM and combination with Visual Basic for Window, FGMCAD is established. The optimum distribution of thermal stress in FGM can he realized by any the relative parameters with FGMCAD, thus the optimum parameters of FGM design are determined.