Based on earthquake damage investigation after the Wenchuan Ms8.0 earthquake

it is discovered that the phenomena of site amplification effects on ground motion were very obvious both in the mountainous area of southeastern Gansu province and the Loess Plateau areas. Combining with the borehole exploration

site seismic response analysis of the typical loess tableland at Pingliang City

Gansu province is carried out applying the dynamic finite element method of two dimensions linearly equivalent for dynamic response numerical calculation; the local amplification effect of the loess tableland is studied as well. The results show that there are seismic amplification effects at loess tableland; and acceleration

velocity and displacement increases with increase in tableland height gradually. Moreover

the low frequency components become more abundant and the high-frequency components are absorbed with increase in tableland height. The long-period components of acceleration response spectrum have increased gradually as well. The numerical results are basically consistent with the earthquake damages

so as to have certain scientific significance for the reasonable seismic fortification in loess regions.