According to the geological environment of the coastal areas of the Haihe in Xichang city,boreholes date of the engineering site were selected and counted by the soil seismic response procedures.Characteristic periods and platform values were confirmed by the Chinese GB5001201 codeand recommended provisions of HEHRP.This paper provided the design response spectrums of exceeding probability of 63%,10% and 3% in future 50 years.The results showed that the amplitude andspectrum of ground motion acceleration were obvious influenced by the hardness of the engineeringsite.The soft site could be expanded the amplification of the peak acceleration and be widened theacceleration response spectrum.