Abstract：Incline buildings can be always found in collapsible loess regions because of the improper ground treatment. Differential settlement of the foundation and inclination of the upper-structure bring the building greatly potential danger. Through research and practice of many projects，an expansive rectifying method that the quicklime piles may be used for the rectifying and reinforcement of foundation is proposed on the basis of theoretical analysis and practical experience，and the computational formula for application amount of expanding material is deduced by using pore extruding principle. This method is to drive mixture quicklime piles into the soil under the foundation by applying control monitoring technology and the expansive slaking lime can extrude the loess under the foundation，lift-up the original foundation and increase the compactness of foundation soil，then the purpose of rectifying and reinforcement of foundation is realized. This method was used in many projects and satisfactory results were obtained.
