In south-west region of Bangladesh, the regular systems of foundation are not appropriate for the massive structure because of an organic soil layer at a distance of 10-20 feet from the ground surface. The existence of organic soil layer causes excessive settlement due to its high compressibility and low shear strength. To solve this matter, soil improvement is needed indispensably because it drops the construction expense and decreases the risk of further damage to the structures. Soil stabilization is an important method in the field of construction. The techniques of stabilization are used to enhance the strength of poor expansive or weak organic soil. This research represents the investigational results acquired from tests performed on organic soil stabilized with rice husk ash (RHA) and strengthened with randomly distributed nylon ?bers. To investigate the impact of RHA and nylon fiber on strength properties of organic soil, standard proctor compaction, unconfined compressive strength (UCS), unsoaked and soaked CBR tests were conducted first on the soil samples partially replaced by RHA with dose 0%, 5%, 10%, 15% ,20% and then soil plus optimum percent of RHA and different content (0.3%, 0.5%, 0.7%, 1%, 1.2%) of nylon fiber. The experimented results disclose that inclusion of different dosages of RHA and nylon fiber in organic soil leads to increase in the optimum moisture content (OMC) and decrease in maximum dry density (MDD). The experimental results also express that the suggested technique is very effectual to improve the strength properties of weak organic soil in words of UCS, unsoaked and soaked CBR values. The result of this research work can be used as a guideline for soil improvement and can be used in the field of civil engineering