To ensure long-term and safe operation for Shuibuya CFRD Project, water quality of the reservoir, composition and causes of the attachments on the concrete face and the strength condition of the concrete face were analyzed. On this basis, causticity evaluation for face slab concrete caused by reservoir water and attachments was completed. The results show that reservoir water is non-corrosive to both the face slab concrete and the steel bars. The main ingredients of the attachments on the concrete face are calcite and quartz, which are basically non-corrosive to the face slab concrete. The strength loss of the face slab concrete has little change, indicating a good operation condition. Considering aesthetics and long-term safety, it is suggested that the attachments on the concrete face should be cleared regularly.