Dense ceramic mixed-conducting oxygen-permeable membrane materials have the potential to be incorporated into a variety of technological systems, including selective oxygen permeable membranes, gas sensors, membrane reactors and solid oxide fuel cells (SOFC). So the oxygen-permeable membranes are getting more attention. In previous works, most attention was paid to materials that have perovskite structure (for example, La-Sr-Co-Fe-O system). In the present work, a Sr-Fe-Cu-O system has been investigated. And SrFeCu0.2Ox was successfully synthesized by solid-state reaction. The factors that influenced the syntheses were discussed. The structure of SrFeCu0.2Ox was determined by XRD. It's found that SrFeCu0.2Ox has a main cubic phase together with a small quantity of remaining CuO, and lattice constant a(0) = 0.3846 nm. Oxygen permeation flux was measured by the GC method. The oxygen permeation flux is 1.70 x 10 (-6) mol/cm(2.)s (STP) at 825 degreesC, showing that SrFeCu0.2Ox is a promising oxygen permeable material.