目前基于特殊润湿性的油水分离膜方面的研究大多只是针对于膜材料的制备方法和分离效率的考察，很少涉及到膜分离过程中相关的动力学过程的考察以及量化计算。文中运用毛细力学的思想考察超亲水膜分离过程的相关物理量，将基于特殊润湿性的膜材料的膜孔归类为毛细管孔道，在此基础上建立数学模型，对超亲水膜分离油水混合物中的受力情况进行了详细分析。从表面张力的角度计算分析了空气中超亲水超亲油膜在水下超疏油的原理；从毛细动力学的角度出发对膜分离过程中的毛细流动速率、毛细管总渗透速率、膜通量以及临界穿透压力等量进行了详细的计算，并通过实验进行了检验；在此基础上初步从毛细力学角度探讨了超亲水及水下超疏油分离膜的分离机理。

The current oil/water separation membrane researches based on special wettability are seldom involved in the dynamic process of the membrane separation and the relevant quantitative calculations. In this paper, by analyzing the physical quantities of the superhydrophilic membrane separation process based on the capillary mechanics and by classifying the membrane pores of membrane materials based on special wettability as capillary pores, a mathematical model is constructed, and it is used to analyze the force distribution condition in the separation process of oilwater mixture by using the superoleophilic membrane. Then, the principle of the superhydrophilic and superoleophilic membrane in the air transforming to be superoleophobic underwater is analyzed from the perspective of surface tension, and the capillary flow rate, the capillary permeation rate, the membrane flux and the critical penetration pressure in the membrane separation process are calculated based on capillary mechanics and are validated by experiments. On this basis, the separation mechanism of superhydrophilic and underwater superoleophobic oil/water separation membrane is preliminarily discussed based on capillary mechanics.