Abstract: The soil-foundation-superstructure interaction analysis method is employed to analyze the performances of the foundation with long-short PHC piles. This method is based on the theories of adjusted foundation rigidity design for reducing differential settlement¹ and soil-foundation-superstructure interaction analysis². High performance geotechnical software zsoil.pc v2010 x64 is employed to solve such problems. The approach to the tteatment of foundation with long-short PHC piles based on the above theories is proposed. Three projects of treatment of the foundation with long-short PHC piles are also introduced. Satisfactory treatment effect is obtained.