This document presents the results of an experimental study investigating the stabilization of black cotton soil using micro silica and Renolith. A series of laboratory tests were conducted on black cotton soil samples with varying additions of micro silica (5-20% by weight) and Renolith (5-12.5% by weight). The results showed that the addition of micro silica and Renolith led to significant improvements in the engineering properties of the black cotton soil, including increased maximum dry density, decreased optimum moisture content, increased unconfined compressive strength, and increased California bearing ratio. The maximum improvements were observed with 15% micro silica and 12.5% Renolith addition. The study demonstrates the effectiveness of micro silica and