Abstract: The anti-seepage face slab of RCC dam is a thin plate structure. For seepage prevention of concrete face slab and concrete durability improvement, it is necessary to coat an effective protection layer. In this paper, some basic requirements for surface protection material were presented, and spray polyurea elastomer as protective coating for concrete face slab was chosen. According to the operation characteristics of concrete faced rock fill dam, lots of laboratory tests on polyurea material were carried out, such as bending test, seepage resistance test, frost resistance test, artificial ageing acceleration test, hydrothermal aging test and so on. Further, field test on concrete face slab at the upper reservoir of Shisanling pumped storage power station was carried out, and follow-up checking and test more than two years was conducted. The results showed that spraying polyurea coating on concrete face slab surface has very good protective effect and worthy popularization.