Sedimentary soils have very low bearing capacity and large settlements, so it may cause frequent damage to the construction above it. This study aims to determine the extent to which the characteristics and strength of sediment soils stabilized with bottom ash and whether the sediment soils stabilized with bottom ash can be used as a pile material. The research method, begins with sampling in the field, then carried out laboratory tests to determine the physical properties / characteristics of the sediment soil. The next test in the form of the use of added or stabilization materials and make improvements to the characteristics of the stabilization method. Stabilization is done by adding Bottom Ash to sediment soils with variations of 5%, 10% 15% and 20%. The results obtained are sedimentary soils including CH (clay which has a high plasticity) soil type based on the USCS (Unified Soil Classification System) system. The highest soil bearing capacity (CBR) is found in sediment soils which are stabilized with a bottom ash of 5%, namely CBR = 7.17%, and an increase of 24.26% of sediment soils without bottom ash. As the conclusion, sediment soils which are stabilized with a bottom ash of 5% and 10% can be used as landfill material