Objective To investigate the shear bond strength between veneering ceramic and zirconia core in different all-ceramic systems. Methods Twenty disk-shaped specimens with 8 mm in diameter and 3 mm in height for each zirconia system（Lava, Cercon, IPS e.max ZirCAD, Procera） were fabricated respectively and divided into four groups： Lava group, Cercon group, IPS e.max ZirCAD group, Procera group. For each group, 10 specimens were sintered with 1 mm corresponding veneering ceramic, while the other were sintered with 2 mm corresponding veneering ceramic respectively. The shear bond strength and fracture mode of specimens were observed and determined. Results The values of shear bond strength for Lava, Cercon, IPS e.max ZirCAD and Procera were （13.82±3.71）,（13.24±2.09）,（6.37±4.15）, （5.19±5.31）MPa in the group of 1 mm thicked veneering ceramics, respectively, while the values in the group of 2 mm thicked veneering ceramics were （38.77±1.69）, （21.67±3.34）, （12.70±4.24）, （9.94±6.67）MPa. The values of Lava and Cercon groups were significantly higher than that of IPS e.max ZirCAD and Procera groups（P
