By means of experiments and systematic analysis of the data, the further research on dynamic characteristics of loess was made. The results show that the typical loess （i.e. of Q₃ and Q₄）have special earthquake engineering property-the seismic subsidence （i.e. subsidence caused by earthquake）. Loess is sensitive to earthquake and its subsi-dence is relatively more serious at the beginning of earthquake; strength of wet loess decreases with earthquakes and sometimes it can even be liquefied.