Due to the influence of repeatedly vehicles load and the environmental periodic variation, cement concrete pavement is damaged regularly and the normal usage of road is influenced seriously. The concrete mix proportion of a new kind repair material of cement concrete - slag base is designed in this paper, and its workability and strength performance is contrasted with the 42.5 ordinary Portland cement concrete. The good repair function and road performance is shown in the result of the test, and this new kind of repair material could meet the road require.