以三个参量(纤维密集区域表征尺寸a、纤维密集区域的体积分数Vc以及该区域内纤维体积分数的偏差ΔVf)表示纤维分布的不均匀性,在假设任何一个纤维密集区域内包含了足够多数量的纤维以及密集区域在宏观上呈均匀分布的基础上,利用等效夹杂法分别讨论了ΔVf对细观裂纹产生的影响以及纤维密集区域的表征尺寸和体积分数对细观裂纹扩展的影响。这些结果有益于加深了解纤维分布不均匀性对复合材料性能的影响 The nonuniformity of the fiber distribution is represented by three parameters (fiber-dense region characterization dimension a, volume fraction Vc of the fiber-dense region, and deviation ΔVf of the fiber volume fraction in the region), and it is assumed that any one fiber-dense region contains enough Based on the macroscopically uniform distribution of the number of fibers and dense areas, the effect of ΔVf on the mesoscopic cracking and the influence of the size and volume fraction of the fiber-dense areas on the propagation of meso-cracks were discussed respectively. These results are useful for understanding the effect of inhomogeneous fiber distribution on the properties of composites