Workability, mechanical properties, deformation performances, thermal behaviors, durability and combination between layers of RCC with containing limestone powder of 20%, 30% and 40% were researched, and the action mechanism of limestone powder in RCC was analyzed. The test results showed that the influence of the limestone admixture on workability, impermeability, antifreeze performance is little, and that with the increase of the limestone powder content, the setting time of RCC is shortened, the adiabatic temperature rise and strength are reduced, the drying shrinkage and autogenous volume deformation are increased, the sulphate resistance property and the combination strength between layers are reduced. Limestone powder used? for RCC admixture in engineering practice has excellent economic, social benefits and wide prospects.