Simulation resin flow behavior by coupling the inter-tow and intra-tow flows,combined with Darcy's law,a u-nit cell of the plain fabric was established.The permeability of unit cell was simulated on the Z directions,and changed the parameters of thickness of unit cell to study relationship between fiber volume fraction and permeability.The results show that permeability decreases with the increase of fiber volume fraction,the simulation results compared with Kozeny-Carman equation,the difference is very small,and in the volume fraction 52.5% overlap,indicates that the calculation program is reasonable.%运用树脂在纤维束内和纤维束间的耦合流动模型，结合Darcy定律，建立平纹织物的单胞模型，模拟预测单胞Z方向的渗透率，并通过改变单胞厚度尺寸参数研究纤维体积分数与渗透率的关系。结果表明：单胞的渗透率随着纤维体积分数的增加而减小，模拟结果与Kozeny－Carman方程对比，二者偏差很小，且在纤维体积分数52．5％处重合，表明该计算方案是合理的。
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