Abstract: Based on the fundamental mechanical tests of 2D woven C/SiC composite material, a macroscopic orthotropic non-linear damage constitutive model was established. In this model, the detectable strains were chosen as variables, and functions in simple form were used to demonstrate the stress-strain relationship of the material under damage evolution caused by uniaxial tension and shear loads, and besides the rule of stiffness change in unloading state respectively. Meanwhile, the unilateral effect and damage-deactivation behavior were also considered. The constitutive model was implemented into UMAT in ABAQUS finite element software, and it could describe the material’s non-linear and linear property of stress-strain relationship in loading and unloading state respectively, and also its load history. Through modeling the open hole plates in tension, strain distribution besides the hole agrees well with the experiment result, which proves the availability of the proposed constitutive model.