Through the strength test without lateral restraint pressure, the effect of lime, fly ash and cement with different ways including only one mineral, two minerals and three minerals mixed in silty sand to the no lateral restraint compressive strength of silty sand is carried out comprehensively. The experimental results show: When one mineral admixture is used to reinforce silty sand soil, the effect of reinforcement of mixing cement is better than that of reinforcement of mixing lime;When two mineral admixtures are used to reinforce silty sand soil, the effect of reinforcement of mixing lime and fly ash is better than that of reinforcement of mixing lime and cement, or cement and fly ash, and mixing lime and fly ash into silty sand soil with lime content more than equal to 6%, and the fly ash content for lime three times is determined to be the optimal mix;There is almost no difference between the reinforcement of mixing two mineral admixtures and three mineral admixtures into silty sand soil.