Abstract： A numerical simulation model for the tensile process of Z-pin reinforced composite T-joints was established by utilizing the cohesive zone model and a parametric study was performed for the distribution of Z-pins. The force-displacement curve of the Z-pin pullout process was obtained by the experiments of Zpin bridging laws. This curve was transformed into the cohesive parameters of the pinned region to simulate the enhancement of  Z-pins to T-joints. The reliability of this model was verified by the static tensile test. Based on the proposed model, the influence of the Z-pin distribution on the tensile capability of T-joints was examined. The results show that as the column spacing decreasers, the pullout force and ultimate load increase. The row spacing has a small effect on the structural bearing capacity. The pullout force is decreased significantly when the distance between Z-pins and the axial plane is increased.