Soil is main part of every building and structure, without soil no structure could stand up. Soil plays a vital role in the constructure of every structure. If soil is strong in shear strength the building above it will also safe from failure/collapse. So, strength of soil is necessary is the construction of foundation, piers, dams, roads and multistory buildings.To increase the strength of soil we have different choices as to replace the weak soil with the strong soil, or to add other materials in soil to increase its strength like cement, lime etc. This study helps in increasing the shear strength of soil by using brick dust and coir fiber which are waste material but can provide sufficient strength.We use the clayey soil from Nandipur, which is weak in nature. Brick dust obtain from a kiln in Faisalabad and coir fiber which are easily available and economical. Direct shear test is performed to find shear strength and its parameters, CBR is performed to find the bearing capacity of soil and Modified proctor test is used to find out the optimum moisture content and maximum dry density of soil. We perform direct shear test at different percentages of brick dust to find optimum percentage of brick dust and then at this optimum brick dust percentage we vary the percentage of coir fiber to find its optimum value and also CBR for the varying percentage of coir fiber.