The permeability performance, that is, the permeability coefficient varied with time of hydraulic roller compasted conerete (RCC) under soft water leakage dissolution was investigated by permeability test with hydrated cement paste, mortar and RCC with different contents of fly ash or additives. The most important factor affecting the permeability performance of hydraulic RCC is its compactness and pore structure. The permeability coefficient of hydraulic RCC under soft water leakage dissolution does not descend because of limited dissolution. So RCC can act as upstream waterproof concrete .