Abstract: Three kinds of multilayer multiaxial interlock 3D woven composites (M3DAWC) were designed and prepared. Digital image correlation system (DIC) and SEM were employed to study the tensile properties of these composites. The results show that the fabric structure has significant effects on the mechanical behavior of M3DAWC. In 0° loading direction, with the increase of the bias yarn volume fraction, the failure mode changes from the neat damage to bias yarn withdrawal. The failure mode exhibits similar trends with that of 0° when the specimens were stretched along 90°, which are pull-out and slippage of the bias yarns. Meanwhile, the volume fraction of the bias yarn also has a significant influence on the tensile strength and modulus of the M3DAWC. In 0° loading direction, the tensile strength and modulus gradually decrease with the increase of bias yarn volume fraction. However, the tensile strength and modulus show an opposite pattern in 90° loading direction.