In order to study the soil-cement based on typical silty clay in Nanchang area, the strength characteristics of soil-cement with different cement incorporation ratios (20%，25% and 30%)，two kinds of admixtures in cluding fly ash and silica fume at different curing ages (7，14 d and 28 d) were analyzed through unconfined compressive strength tests in laboratory, and the relevant stress-strain curves were drawn. The experimental results indicate that with the increase of cement incorporation ratio and curing age, the unconfined compressive strength of soil-cement increases accordingly, and the growth rate of its strength decreases with the increase of curing age. Replacing fly ash with silica fume as the admixture of cement soil has a promoting effect on the unconfined compressive strength, and the strength increases obviously at a specific cement incorporation ratio and age. The failure mode of soil-cement gradually develops from plastic failure to brittle failure with the increase of cement incorporation ratio and age. The functional relationship between the deformation modulus and the compressive strength of silica fume soil-cement approximately satisfies the linear regression model, which is E₅₀=20q_u .