Abstarct: Polyurethane foam injection is one of the ways to control building settlement. The method is to drill boreholes at regular distances by the boring machine and fill these wells with fluid material accordingly these materials penetrate with different absorption systems and create pressure in the intended ground, this method is expensive and in special cases such as soil bed stabilization is used for soil improvement. The urethane bond is formed by the reaction between a chain diisocyanate and a polyal. Application of polyurethane foams in industry includes soft foam (in furniture and chair foam), hard foam (in wall and ceiling insulation), thermoplastic foam (in medical equipment), shoe soles, sealant and elastomer foam (in flooring and auto parts). In this study, the compressive strength of polyurethane foam with different densities is tested to find the best mixture percentage of isocyanate and polyurethane in terms of compressive strength and amount of expansion and their stress and strain diagrams are drawn. Then, with the compressive strength machine, the rising stress of polyurethane foam is obtained. The results show that the best mixture for making polyurethane foam is with the ratio of 5% hard polyol, 45% wood polyol and 50% isocyanate, which maximum compressive strength of 2 MPa is obtained in the elastic state. Then, with the same ratio, the consolidation test was performed to investigate the parameters of one-dimensional consolidation, which compression index (Cc) equal to 0.121, swelling index (Cs) equal to 0.018 and recompression index (Cr) equal to 0.019 was obtained. By comparing the compaction coefficient of polyurethane foam with different types of soils, it behaves similarly to hard clay, which can be a suitable alternative to settlement soil. The stress applied by polyurethane foam during expansion is 192.3 kPa.