Abstract: This paper developed an integral method with the integration path of warp direction to predict the macro elastic property in warp direction of 2.5D woven composites. The evaluated elastic modulus was compared with experimental results and classical volume average method. It shows that the predicted value is much better, and the predicted method is more effective. The distribution of elastic property during woven cyclic process in the warp direction of 2.5D woven composites was investigated, and some experiments were done with similar woven structures of 2.5D woven composite. It shows that the smaller bending angle of warp and the additional straight warp can improve the elastic property in the warp direction of 2.5D woven composites, and the nonlinearity of stress-strain curve can also be improved.