As the complicated calculation parameters of the response displacement method

based on the basic case

a sensitivity analysis of four calculation parameters（coefficient of the spring

ground deformation

ground shear force

inertia force）were conducted

and the methods for obtaining the parameters and the error sources of the methods were summarized.Then

two calculation models were analysed.The conclusions show that the ground shear force has the greatest influence on the internal forces of the structure

and then is the ground deformation

the inertia force

and the coefficient of the spring.In the selection of the calculation model

there are two models

one is with spring at the top of the structure

the other is not.The internal forces of the former are greater than that of the latter.Ignoring the upper soil constraint effect leads to the calculation results being unsafe.