Abstract: Based on membrane extraction and helical tube technique, the mass transfer performance of some membrane modules with a different helically wound hollow-fibre was studied with the system of 30%TBP (in kerosene)-water and phenol as the solute. The effects of two phase flow rates, geometry of the membranes on mass transfer coefficients were investigated. The experimental results show that the helically wound hollow-fibre membrane makes much better performance in mass transfer. With an increase in the velocity of the aqueous phase in the tube, the overall mass transfer coefficients increase very quickly. The overall mass transfer coefficients have some relationship with the configuration parameters. When the pitch and inner diameter of the coiled membrane is decreased, the mass transfer coefficients will be increased. The overall mass transfer coefficients can be predicted with an equation.