In this study, two viscous models, the Choi-Schwalter and Phan-Thien-Pham models, are used to calculate the isotonic swelling ratio of emulsion liquid membrane. The purpose is to evaluate the usefulness of calculating isotonic swelling ratios of emulsion liquid membranes by viscous models through comparing theoretical isotonic swelling ratios with experimental swelling ratios of three kinds of emulsion liquid membranes. Comparison between theoretical swelling ratios and experimental swelling ratios indicates that experimental swelling ratios are close to those calculated by the Choi-Schwalter model, but lower than those calculated by the Phan-Thien-Pham viscous model. But modified Phan-Thien-Pham viscous models predicts reasonable values. Therefore, the method of calculating the isotonic swelling ratio of emulsion liquid membrane by theoretical viscosity models is promising.