Abstract: In this paper the method of design and construction of lime and cement columns for the stabilization of trench, deep excavations and slopes is introduced. Lime or cement columns are installed by mixing unslaked lime powder or cement insitu with soft clay. It has the advantages of good in permeability, low lime consumption, without vibration during construction and less soil displacement disturbances. The strength mechanism, the loading and rupture theory, the design scheme and safety factor should be taken in design of lime columns are also given. The text is illustrated with Swedish case histories.