Abstract: The amount of tire wastes, an unwanted urban- industry surplus, has been increasing every year throughout the world. One of the chances to dispose of this waste material is to use these refuses, as a stabilizer in soil, in order to increase the strength properties and bearing capacity of the soil stabilizer mixture. In this thesis, in order to study the influence of tire waste on shear strength and bearing capacity of soil, experimental has been performed on soil sample with different tire ratio powder of waste have been used in this study. Various crumb rubber powder having 0%, 5%, 10%, 15% were chosen. To find the effect of tire waste on shear strength direct shear test device has been used and CBR test apparatus has been utilized to study the effect of tire waste on the bearing capacity of the stabilized soil. It was found that shear strength of black cotton soil is increased with addition of 10% of CRP Addition of 10% of CBR to the soil increases CBR value but if the percentage of CRP increase more than 10%, the soil strength gradually decreases.