Abstract: The article presents the methods for treatment of the deep layer of liquidizing foundation in the region of Yantai. Based on the result from computing with relevant empirical formula, identification of liquidizing conditions of the silt layer was made, and accordingly three alternatives for the said treatment decided. After making both technical and economic comparison between the three methods, one of them was finally selected. It covers a treatment as increasing the thiekness of the non-liquidizing soil covering layer. This method is referable in the aspect of treatment of deep layer liquidizing foundation.