对测定中空纤维超滤膜孔径大小及其分布的物质迁移方程法进行了改进，并考察了浓度对聚醚砜（ＰＥＳ）中空纤维膜孔径大小及其分布的影响．随纺丝液中ＰＥＳ质量浓度的增大，膜的孔径变小，对聚乙二醇的表观截留率增大，膜的纯水透过率减小，在大约２４％的ＰＥＳ质量浓度时出现临界值，大于该临界值，膜的结构和性能均发生急剧变化． The mass transfer equation method for determining the pore size and distribution of the hollow fiber ultrafiltration membrane was improved. The effects of the concentration on the pore size and distribution of the hollow fiber membrane were also investigated. As the mass concentration of PES in the spinning solution increases, the pore size of the membrane becomes smaller, the apparent rejection of polyethylene glycol increases, and the pure water permeability of the membrane decreases. At a PES concentration of about 24% Appear critical value, greater than the critical value, the structure and properties of the membrane have undergone dramatic changes.