Abstract: This investigation concentrates on the removal of chromium(VI) from wastewater by liquid membrane emulsion. A nonpoisonous carrier, tribulyl phosphate(TBP) and a surfactant, succimide derirative, which is a kind of polyamine and thus can resist the corrosion of acid and base are used in the new membrane system. The seperation effect is found to be higher than the results of previous researches. Apart from the composition of the membrane, several important factors are discussed as well. Considering characteristics of seperation process of dilute solutions, a very simple geometric diagram of membrane and a mass transfer model have been proposed. Since there exists breakage of membrane, a simple but valid method is used to take this effect into account. Experimental data on the batch extraction of chromium(VI) from wastewater are in good agreement with the model predictions under some conditions.