Abstract: Based on the meso-structure of 2D braided C/SiC composites, two micromechanical models were presented to simulate the progressive damage behavior of 2D braided C/SiC composites that subjected to off-axial tension. The equivalent elastic constants and strength of the carbon fiber/pyrolytic carbon interface/SiC matrix model were calculated by the finite element method and then applied to the yarn/SiC matrix model. The Tsai-Wu failure criteria that considers different damage modes was utilized to set up the progressive damage model, and the stress-strain relation of 2D braided C/SiC composites was simulated. The damage model explains the damage evolution of 2D braided C/SiC composites tows in the complex stress state. The numerical results accurately capture the experimental data, which demonstrates the validity of the proposed analytical model. And this model provides a method to predict the mechanical properties of 2D braided C/SiC composites.