Abstract: This paper introduces small piles of calces,sand and cement.According to engineering geological characteristics of soft foundation,small piles of calces,sand and cement is used for treating the soft foundation(filling of unclose-grained), the bearing capacity of composite foundation is greatly increased, both the bearing capacity and subsidence of composite foundation meets the need of engineering design through subsidence observation and laboratory experimentation, meanwhile, economy benefit of the method is also analyzed. Engineering application shows the method is well, and has several advantages: convenience, simpleness, rapid construction, little impact on surrounding and lost cost ect. So the method of small piles of calces, sand and cement has bright market prospect.