Abstract: A warp skeleton method was proposed to solve the descriptive issue of arbitrary 3D woven composite architecture，with the unit cell being decomposed into subcells/grids. The subcell vector concept was introduced to digitalize the 3D architecture，in order to use the 2D database table to store it. An initial rupture model was built by the digitalized data and the classical cross-section hypothesis，an iterative algorithm was used to optimize the model，amied at approaching the real world model，and thus the 3D solid model and mesh generation were completed. The results show that the iterative method can naturalize the tow pattern，with the model approaching the physical composite. The numeric analysis results show that the rate of astringency of the iterative algorithm is optimized when the proportion for moving warp and weft was situated between 0.6～0.7.