The Aim of this review paper is to study the various industrial waste used for stabilization of Expansive soil in road subgrade. Expansive soil have tremendous strength but it becomes very soft when it getting wet, It expands/swell due to its mineralogical composition during its wet condition, It creates cracks or consolidated when it is dry. Expansive soils can be found on almost all the continents on the Earth. First various literature was studied and finally an industrial waste Iron Sludge was suggested because of its higher density for stabilization of expansive soil.