Purpose: The purpose of this study was to investigate the effect of three types of veneering porcelain on the bending strength of KAVOTM Y-TZP/porcelain layered structure.Methods: KAVOTM zirconia ceramics were selected as substructure.To forming Y-TZP/porcelain bilayered structure,a leucite based veneering porcelain was fired on the zirconia substructures by slipcasting technique with dentin washbake,and two nano-fluorapatite based veneering porcelain was fired on the zirconia substructures either by slip-casting or pressed-on technique with or without liner coverage.Bending strength was tested according to ISO 6872 standard,and the veneered surfaces of fracture samples were analyzed by SEM.