Abstract: Abstract: Chemical substances such as lime, phosphate and sulfur dioxide are needed in the sugar refinery process, resulting in high COD (chemical oxygen demand) of factory sewage and high cost. Membrane technology has the advantages of low energy consumption, no phase change and molecular screening, which may improve the clarification effect of mixed sugar juice and reduce the chemical adding quantity. However, the concentration polarization phenomenon causes the decrease of membrane flux, so a more effective method is needed in order to improve the membrane process for the clarification of sugar mixed juice. Magnetic field combined with microfiltration process is a key issue in recent years, but there are few researches about the proper mass transfer phenomenon. So, the mass transfer modeling of microfiltration process for magnetic cane mixed juice was studied in this paper. By analyzing the mechanism of mass transfer process on the membrane surface, the mass transfer model of microfiltration was deduced according to the theory of osmotic pressure and gel layer. However, the sugar cane mixed juice suffered different adsorption effects on the membrane surface and concentration polarization layer. The forming trend of the adsorbed layer on the membrane surface had close relationship with its surface properties. Therefore, adsorption effect was considered in the process of deducing model. The mass transfer modeling of microfiltration process for magnetic cane mixed juice was deduced at two important cases under the optimum magnetic conditions. Without considering the adsorption of membrane surface layer, the mass transfer coefficient of 0.45 μm ceramic microfiltration membrane for separation was -81.406, the regression equation was significant, and the value of R2 was 0.921. While the mass transfer coefficient of 0.20 μm ceramic microfiltration membrane for separation was -83.130, the regression equation was significant, and the value of R2 was 0.920. When considering the adsorption of membrane surface layer, the mass transfer coefficient of 0.45 μm ceramic microfiltration membrane for separation was -323 254.006 and the adsorption coefficient was 0.995. Its regression equation was significant, and the value of R2 was 0.939. The mass transfer coefficient of 0.20 μm ceramic microfiltration membrane for separation was 573281.937 and the adsorption coefficient was 0.994. Its regression equation was significant, and the value of R2 was 0.999. Both membranes were affected by the concentrations of the main flow and penetrating fluid, and the membrane surface adsorption. Retest results of model showed that the calculation results and error rates of two mass transfer models in which the adsorption process was considered were better than that without considering the adsorption process. The solid particles accumulated on the membrane surface to form the filter cake, and the filtrate moved between the filter cake and the channel of membrane tube through the pressure difference across the membrane and solute concentration difference. When membrane flux was stable, the absorption between solute and solution achieved a balance, which made a higher accuracy and a lower error rate for the models. All results showed that the mass transfer model containing the adsorption of membrane surface was suitable for the separation process of 0.45 and 0.20 μm membrane. This study is helpful for the improvement of membrane separation equipment, and the optimizing of operating conditions.