Abstract:Permeability is an important factor determining leaching efficiency during process of CO2+O2 in-situ leaching. It is quite significant to raise permeability in uranium leaching. The factors leading to drop of permeability of ore layer during leaching and research progress of infiltration enhancement methods are introduced. Although problem of how to inhibit chemical precipitation is solved to a certain extent and there is progress in well washing technology, research on mechanism of permeability and micro-scale changes is yet comprehensive enough. Research of improving permeability is still at experimental exploration stage, which has not been effectively applied in actual production.