Abstract：On the base of theatrical analysis，experiment results and the numerical simulations，a new method of calculating the settlement of composite pile foundation—modified simplified stress method is put forwarded，and is applied to three project cases. This method takes the compress of soil between piles into account，which accords with the deformation characteristic of composite pile foundation. The comparisons of calculation results and measurement dada show that the new method enjoy the merits of simplified calculation，clear physical concept and certain precision. So it is convenient to apply the method to the practical engineering.
