Combining with the practical project，this paper presents the scheme of foamed mixture lightweight soil in soft soil foundation treatment.According to the groundwater corrosion strength，it calculates the subgrade bearing capacity and settlement.The results show that it will not increase the additional stress and settlement after construction.Considering the influence of groundwater corrosion and controlling the depth of over excavation by the plain fill thickness，both the foundation’s bearing capacity and settlement after construction can meet the requirements.It provides a reference for soft soil foundation treatment.