Expansive soil have the tendency to swell or shrink depending on its moisture content. Due to such expansive characteristics of soil, the structures constructed over this may develop some cracks in due course of time. This paper presents the effect of stone dust on the expansive soil, the following test were performed on soil-stone dust mix specimen; Atterberg’s limit, Standard proctor test, California bearing ratio. The stone dust content varied from 10 to 40%. The CBR test were performed for 3days soaked condition. It is there for essential to stabilize such soils, prior to any construction work carried out on this to improve its engineering properties.