Soil stabilization is given more emphasis in order to enhance the geotechnical characteristics of expansive clay to meet technical requirements in the building sector. The additives selected for this project are rice husk ash, stone dust, and cement. The goal of this study is to determine whether it is possible to use these stabilizers to improve the engineering behavior of problematic soil. After determining the natural property of the soil sample, different percentages of cement (2 and 4%), stone dust (3, 6, and 9%), and rice husk ash (5, 10, and 15%) were added to black cotton soil samples. The tests are the California bearing ratio, unconfined compression strength test, free swell index, Atterberg limit test, compaction test, etc. When the test results were examined, it was found that the sample soil that had only received cement treatment greatly improved in terms of strength metrics and had a reduced risk of swelling. Only slight improvements were seen in the soil's strength and swelling potential after treatment with simple rice husk ash and stone dust, but there was a reduction in the plasticity index. The mix proportion of 2C9SD10RHA had a maximum CBR and UCS value of 65.3% and 421.6 kPa, respectively. Therefore, we can use 2C9SD10RHA as a subgrade material. Keywords: Black cotton soil, Stabilization, Cement, Stone dust, Rice husk ash