The infiltration corrosion characteristics of concrete have been studied by determining the seepage coefficient and CaO and SiO2 dissolutions of concrete. The results show that, under the infiltration corrosion of soft water, the infiltration coefficient of concrete decreases gradually with the corrosion time prolonging, but finally goes to a special value. The CaO and SiO2 accumulative dissolutions increase with the time prolonging, and also finally go to a special value. The amount of CaO dissolved by seepage water can be used to evaluate the erosion durability of concrete. The common concrete in this paper is durable at the action of soft water erosion.