With nanometer silica selected as cement-stabilized additives,compressive strength and deformation properties of cement-stabilized soil are discussed on the basis of a lot of laboratory tests. It is pointed out there has a proper nanometer silica content for compressive strength,and by using orthogonal test the magnitude of compressive strength influence factors are analyzed. At last the author discusses the statistical laws and relations between failure strain,deformation modulus and confined pressure,compressive strength of cement-stabilized soil.