Inordertoinvestigatetheenvironmentaldurabilityoffoamedlight-weightsoil，the dry-wet cycle test of foamed light-weight soil under freshwater and seawater conditionsand the erosion test of foamed light-weight soil under five conditions of water standard iza-tion， standard culture， seawater conservation， NagS Oq solution erosion and MgSO solutionerosion were carried out.The compressive strength test was carried out.The variation ofthe compressive strength of foam light-weight soil with the number of dry-wet cycles underthe conditions of freshwater and seawater， and the influence of foaming light soil strengthunder differentcuring conditions and differentageswere revealed.The testresults showthat the compressive strength of foamed light-weight soil is greatly affected by the dry-wetcycle， and the dry-wet cycle under freshwater conditions is not much different from the dry-wet cycle under seawater conditions.The presence ofwater has an important influence onthe strength development of foamed light-weighs oil， and the influence ofseawater on its strength is small.Sulfate has an important influence on the long-term strength of foamedlight-weight soil.