In recent years, the use of various waste materials in ground improvement has gained considerable attention worldwide in view of increasing costs of waste disposal and environment constraints. One of these waste materials is the sugarcane bagasse ash, which is obtained from the burning of bagasse in sugar producing factories. Qena governorate which is situated at 594 km south of Cairo has three sugar factories, these factories face a disposal problem of large quantity of bagasse ash (BA). The chemical analysis of bagasse ash showed that this material contains amorphous silica which is an indication of cementing properties, which can develop a good bonding between soil grains. Many researches have been carried out for stabilization of soil by using cementing, chemical materials, e.g. fly ash, cement, bagasse ash, calcium chloride, sodium chloride, etc. El-Salheya area which is located at 2 km east Qena governorate has suffered greatly from the influence of expansive soil on structures founded on it, where many buildings have a lot of cracks due to founded on expansive soil. In this study different laboratory tests were conducted on El-Salheya expansive soil with varying percentage of bagasse ash (4%, 8%, 10%, 13% and 15%) to check it's effect on the index, swelling properties of this soil and compaction. The obtained results indicated that the measured index properties values of studied soil (liquid limit, plastic limit, plasticity index) and swelling properties (free swelling, swelling pressure) are reduced substantially with increasing the percentage of bagasse ash and remain stable after reaching a certain concentration value which is known as the optimum value. Also, unconfined compressive strength is increased with increasing the percentage of bagasse ash. A compression between the obtained results and the previous research results is conducted.