Abstract: Carbon fiber triaxial woven fabric/epoxy resin (TWF/EP) composite was prepared by resin film infusion (RFI) method, in which T300 carbon fiber was reinforced material, and epoxy resin was matrix.Three-point bending test and tensile test were carried out to study the in-plane bending and in-plane tensile properties. Moreover, 3D profilometer was used to observe the damage morphology of sample after tensile test, and damage mechanism was analyzed. The results show that the bending elastic modulus of TWF/EP composites is quasi-isotropic. The porosity of composite and width of the fiber bundle have significant positive correlation with the bending elastic modulus, and have a negative correlation with the tensile modulus. The primary tensile failure patterns of composites may include tows pull-out, tows fracture and staggered failure. The tensile fracture mechanisms are mainly pure shear failure, torsional shear failure and tenso-shear coupling failure. In addition, the strain concentration region occurs at the interlacing point of the yarn during the progressive damage process.