To investigate the influence of the half-lapped joints on the bending moment capacity in the two-way directions of Cross-Laminated Timber（CLT）floors，out-of-plane bending tests in the major and the minor strength directions were performed，respectively. The test phenomena and failure modes at ultimate state in both loading di? rections were discussed，and the effects of the screw diameter，the screw spacing，and the lap length on the bending moment capacities and the strains in the mid-span cross-sections were investigated. Combined with the test phenom? ena，the deformation characteristics of the self-tapping screws in the minor direction at ultimate state were summa? rized. A calculation method for determining the bending moment capacity in the minor direction was developed，and the calculation results were compared with the test values. The results showed that the failure mode of the specimens in the major direction was the mix mode（the embedment failure，and the tensile fracture or the rolling shear of the layer），and those of the specimens in the upper lap in the minor direction were characterized by two failure modes， including the mode I（the embedment failure and the pull-through failure），and the mode II（the splits along grain in the upper lap and the pull-through failure）. The increase of the screw diameter and the decrease of the screw spac? ing had no significant influence on the bending moment capacity in the major direction. The increase of the lap length and the decrease of the screw spacing significantly improved the bending moment capacity in the minor direction. The calculation method proposed in this paper predicted the ultimate bending resisting load in the minor strength di? rection reasonably，which laid the theoretical foundation and provided the structural design reference for the promo? tion of CLT two-way slabs in the engineering application.