Abstract: CFG pile is a kind of high strength pile with good adhesiveness which is the mixture of cement, gravel, stone chips or sand, fly ash with water, it is combined with soil between piles and cushion into the composite foundation, in which the bearing performance of soil between piles is fully used and the load is transferred to the deep stratum by the cooperation between piles and soil between piles. The CFG pile composite foundation has good technical performance and economic effects. Based on the engineering, its application is introduced in ground treatment.