Based on the flied application of composite foundation in Xuwei Section，Lianyungang，experimental study on anti-corrosion performance of cement-soil with the large amounts mineral admixture was carried out.The mechanical properties，sulfate resistance and the compressive strength in different curing conditions of cement-soil were measured，the cementitious material in composite foundation was designed.The results show that using large amounts mineral admixture can ensure the mechanical properties of cement-soil，and improve the anti-corrosion performance of cement-soil in composite.