Cemented soil in anti-seepage engineering usually directly or indirectly encounters underground corrosive media environment, which may lead to decrease or even failure in impermeability. For this purpose, the permeability tests are conducted on the cemented soil with different cement ratios under the sewage and clean water conditions, respectively. The effects of curing ages on the permeability of cemented soil are investigated, and the evolutions of ion concentration in cemented soil after permeating are also analyzed. The result shows that for the samples soaked under clean water curing condition, their permeabilities decrease gradually with increasing curing age, and this decreasing rate becomes more slowly when the curing age exceeds sixty days. For the specimens soaked under sewage curing condition, their variations of permeabilities are similar with those of specimens with the curing age less than sixty days under clean water curing condition. However, an increase in the permeability is observed when the curing age exceeds sixty days. This phenomenon is attributed to the erosion effects of sewage on cemented soil. Under both clean water and sewage curing conditions, the permeability decreases gradually with the increase of cement content. With the increasing of curing age, the concentrations of Ca2+, Mg2+, Cl? and SO42? in cemented soil gradually increase under sewage curing condition, whereas the concentrations of Mg2+, Cl?, SO42? gradually decrease under clean water curing condition. The research results can provide technical parameters for the impermeability and durability design of cemented soil in anti-seepage engineering, which have an important engineering significance.