In this article, the preparation of porous PVA membranes by the supercritical CO2 fluid was introduced. The effects of pressure, temperature, and action time of the supercritical CO2 fluid have been studied on membrane transport parameters, viz. pure water flux, PEG600 transport parameter. It has been concluded that under difference supercritical CO2 fluid conditions, difference membrane structure was developed, which were also summarized in this article. (C) 2008 Elsevier B.V. All rights reserved.