Abstarct: Industrial development and mine spreadingare some of effective factors on the production of pollutants containing heavy mextals.In addition to causing geotechnical problems and changing the soil strength parameters, pallutants can enter the under ground water cycle and threaten human health.So, stabilization and solidifying with cement as the best modification method for adjustment pullotion Were chosen. High efficiency, accessibility and low cost are some of the advantages of this method.The Solidification/Stabilization of heavy mextals contaminated soil by using Ordinary Portland Cement (OPC) was studied as a hazardous treatment technology.In this study, an investigation on the effect of freeze-thaw cycles on consolidation clay soil parameters were conducted.Due to the importance of settlement in clay consolidation oedometer experiments was performed clay polluted with lead nitrate was exposed to freeze-thaw cycle after stabilization.The results showed that the major changes occured in cycles 7&12.According to the results ( Cs,Cc &Pc), 10% of cement has been considered as the optimum amount of cement for solidifying the polluted soil exposed to freeze-thaw cycle.