Abstarct: Fine-grained soils usually swell due to water absorption and show high settlement when losing water. Therefore, engineering structures built on this type of problematic soils would be damaged. Roads, retaining wall, buildings foundation, dams and in general more structure in which clay is in contact with water are at the risk of failure due to swelling and settlement So that a significant cost estimated annually for these damages. To deal with this problem there are several ways including strengthening of unsuitable soil and land, using piles and deep foundations, redesign of structure, considering the soil limitations, soils stabilization with additive materials and eventually changing the location of project. Stabilization of soil by adding polymer is one of the new methods that has no adverse effect on environment and past researches have shown that adding polymer has positive impact on soil strength. In this study, the effect of adding one type of polymer (Polyvinyl alcohol) on the clayey soil settlement has been investigated. For this purpose, after initial tests including gradation, compaction, determination of moisture content and Atterbarg limits tests, the soil was mixed with different percentages (0.4, 0.6, 0.8, 1 and 1.2 percent) with polymer (polyvinyl alcohol) and was treated for 24 hours and then it was treated for consolidation. The results showed that the combination of this material with clay significantly reduce the amount of soil settlement and consolidation's rate in which the percentages of 0.8 and 0.6 have the highest impact on the samples..