Based on the data from typical sites in the Jianghuai region，many kinds of soil layer sites for the seismic response was modeled by choosing different depth strata as the seismic wave inputting interfaces． The seismic wave inputting interface effect on ground motion parameters was analyzed with the one dimension equivalent linear method in frequency domain by choosing the Taft，Kobe and Elcentro strong motion records as the earthquake input． The results show that when the inputting interface depth increases，the peak ground acceleration increases，and the increase rate decreased，but the depth changes of the inputting interface have less effect on the characteristic period of the acceleration response spectra． Meanwhile，the shear velocity variation of the inputting interface has little influence on the characteristic period of the acceleration response spectra，but it has significant influence on the peak ground acceleration． The peak ground acceleration increases with the shear velocity variation of the inputting interface，and both increase linearly approximate．