Objective:To evaluate the effects of surface treatments on bond strength of pressed and build－up veneering porcelain to zirconia. Methods:CAD/CAM Y－TZP blocks were fabricated and classed into 6 groups. Groups A1 and B1 received no treatment (as the control group),groups A2 and B2 received dye－penetrating technique,groups A3 and B3 were tribochemically silica coated. Then,groups A1 to A3 and groups B1 to B3 were veneered using build－up technique or lost－wax press technique respectively. The double－layered specimens were subjected to shear bond strength(SBS) testing. Data were statistically analyzed using one－way ANOVA and LSD test (α=0.01). The treated Y－TZP surface and the typical fractured Y－TZP surfaces were examined using a scanning electron microscope. Results:No matter which methods were used for treating Y－TZP surface,there was no statistically significant in the mean SBS values between the two veneering techniques. When using build－up veneering technique,tribochemically silica coating provided the highest SBS,while no statistically difference was found among the surface treatments of Y－TZP blocks for the lost－wax press technique groups. Conclusion:Dyeing and veneering techniques had no influence on bond strength of zirconia to veneering porcelain,while silica coating significantly improved the bond strength for the build－up veneering technique.