In order to examine the failure of uniaxial tension of mechanical perforated 3D woven composite lug joint， a multi-scale analysis way was used to investigate the pore edge yarn failure process. The results showes that there were a lot of longitudinal damage in the continuous warp yarn near the hole of orthogonal three-way（ORT） woven composite joint， a large number of transverse damage appeared in the weft element， and the damage gradually expanded along the 45° direction of the hole edge， there was shear damage in the weft yarn， finally， the joint failed shear failure. The error between the numerical simulation and experimental results is 1.14%， which verifies the correctness of the multi-scale finite element simulation method. The yarn damage in the meso-area of the hole edge extends from the hole edge to the edge of the side joint. The distribution position of hole edge yarns is different， and the destruction form of yarns is different， but it does not affect the expansion trend of destruction.