The Aim of this project is to define improvement in Geotechnical properties using polyester yarn waste and yarn in black cotton soil. This type of soil works like hard substance when it is dry but in the wet condition the soil loses its strength. So it is required to improve its quality. The bearing capacity of black cotton soil increased with the help of yarn . So this material can be used in black cotton soil as a recycled component to reform the nature of soil. Stabilization is the concept about reduce the bearing capacity of expansive soil by using these materials. The supporting power of a soil substance referred to as its bearing capacity. Stabilized earth is a composite material, a combination of soil and reinforcement suitably placed in layers to the resist tensile stress. Using this technique, We can improve the stability of the available expansive soil, increase the load bearing capacity, and also helpful in controlling the earthquake vibration. It would be good for reinforcement of soil to improve the properties of weak soil using polyester yarn. In this study the Yarn is used as the reinforcement material in the black cotton soil with the comparison of Soil. By Adding the alternate proportion of yarn we can see the increasing strength of soil.