Tests were conducted to investigate the influence of using nanomaterials in the modification and stabilization of soft soil. The soft soils were collected from two different sites and treated with three nanomaterials (nano-copper, nano-alumina, and nano-magnesium). Nanomaterials were added in small amount (≤ 1.0%) by dry weight of the soil. Laboratory tests to determine the compaction characteristics and unconfined compressive strength were performed. Results of the investigation showed significant improvement in maximum dry density, and unconfined compressive strength. The improvement is dependent on the type of nanomaterials. The unconfined compressive strength and maximum dry density increased as the nanomaterials content increased until reach a percentage after which the strength will be decrease. Nanomaterial contents in excess of the optimum content cause agglomeration of particles that adversely affects the mechanical properties of the soils. In general, the addition of finer particles such as nanomaterials, even at low doses, could enhance the geotechnical properties of soil. Also considering the possible negative environmental effects of chemical addition to soils, the possibilities of using nanomaterials as stabilizing agents of soft soils this combined admixture is intended to reduce the cost and promote a more environment-friendly and sustainable stabilizing agent.