The residual stress on the surface of glass-ceramics & ceramic composite tiles was evaluated by X-ray diffraction stress measurement. It was found that the residual stress on the polishing glass ceramic surface was small. Through analysis of the causes to result in surface residual stress of glass-ceramics & ceramic composition tiles, it was pointed out that the measured residual stress by XRD was caused by thermal stresses which were developed by temperature gradients while cooling and the differences ther...