Due to the wide spread of soft soil in Japan, different cement stabilization methods have been used to improve the soil property. Recently, the waste disposed by many industrial plants has been utilized effectively by cement stabilized method. The typical example is the utilization of disposed coal ash by thermal power plants. Currently, effective utilization of coal ash depends on cement raw materials. Under the situation of public work projects declines, it has led to the decreasing demand for cement. The cement stabilized soil will be excavated for construction work in future and reused. The excavated cement stabilized soil is usually resulted from road maintenance and repair of lifeline such as water and gas pipes. However, the excavated cement stabilized soils have been disposed due to the unknown characteristics of these materials. Therefore, studies on excavated cement stabilized soil should be carried out in order to encourage the recycling-oriented society. Correspondingly, this study deals with recycling and reusing of cement stabilized soil and/or cement stabilized soil mixed with coal fly ash, and examining the effect of reusing of cement stabilized soil on strength characteristics. The results of this study show the possibility of reusing of cement stabilized soils as alternative construction material.