Among the pozzolanic additives, microsilica, which is the product of lateral arc furnaces, has the best performance in concrete, which researchers have reason to consider to have a high amount of silica (more than 90%). The new pozzolanic substance that has recently been considered for use in concrete is nanosilica, which is a solid powder or emulsion in water. Given the fact that the impact of adding various types of cement in recent years on various physical parameters and The mechanical properties of soil-cement have been investigated. In this study, the effect of adding nanosilica on shear strength parameters of cement soil in combination with nanosilica is discussed. Soil used in clay sand (SC) research, and the parameters measured in these experiments included different enclosure stresses, processing time, amount and type of silica material that were tested on different mixing designs. . The results of the experiments indicated that the soil-cement materials were more suitable for the shear performance by adding silica products.