Extraction by hollow fibers are fast compared with conventional extractional equipment because of the large surface area per volume, and the feeds can be contacted at high speed and two flows are completely independent, so there no problems withlaoding, flooding and channeling. In this paper, it was investigated the flow rate of aqueous and organic solution by using the hollow fiber membrane. It is known that the mass transfer is done as the flow rate of aqueous phase increase. For the system with high distribution ratio, effect of the distribution ratio on mass transfer was weak in system in the hollow fiber membrane.