In this study, the effect of temperature on volume strains in three types of local clay soils was studied after adding different percentages of sand for each soil (10%-20%-30%40%-50%) when temperatures change from (20-60)° C to be used as liners in solid waste landfill sites . The results of the study showed that the mixing of sand with the clay played a key role in reducing the magnitude of volume strains between (24-27%) of the value of strains.