To reduce the project cost and alleviate the environmental pollution problems，the foam lightweight soil was prepared by replacing cement with calcium carbide slag，gypsum and slag solid waste in this study，and the influences of clay content on durability of solid waste foam lightweight soil were investigated. The results show that when the clay content increased from 0 to 45%，the compressive strength of samples at 7 d varied from 2.16 to 0.58 MPa，and the 28 d splitting tensile strength decreased from 0.73 MPa to 0.18 MPa. After 10 of wetting-drying cycles，When the clay content was 0%,25% and 35%, the compressive strengths of the specimens were 2.06,1.28 and 0.62 MPa respectively.At a clay content of 45%, the samples were completely destroyed after 10 freeze-thaw cycles. In addition， the shrinkage strain of all samples increased rapidly at 7 d before curingThe strain range was from 1 523 × 10-6 to 1 932 × 10-6. The improvement in shrinkage is more evident at a clay content of 25%～35% than at a clay content of 45% of the foamed lightweight soil. It is recommended that the clay content of foamed lightweight soil used as a fill for a road bed should be less than 25% and that of a fill for an embankment should be less than 35%.