Abstract: An experimental study of roller compacted concrete with high dolomite powder content has been conducted for design of a hydropower station in Southwest China to expound and prove the feasibility of using dolomite powder as a substitute for fly ash and a mineral admixture of such concrete. The results show that roller compacted concrete of strength grade C9020 can be prepared by using dolomite powder content in the range of 50% ~ 55%, reducing water/cement ratio, and increasing cement content, through application of reasonable mixture design and parameter optimization. Its frost resistance and permeability resistance, along with its ultimate extension and tensile strength etc., can all meet design requirements. Thus, this study has proved the feasibility of high dolomite powder content technology for mix of roller compacted concrete.