Abstract: Based on the analysis of earthquake damages in Dedu County of Heilongjiang Province and the experimental data from dynamic triaxial stress strain test of frozen soil in low temperature, this paper presents the necessity of research of the dynamic characters of seasonal frozen soil, and gives out the calculated result of the values of elastic modulus, Poisson′s ratio, shear modulus and damping ratio of frozen soil under dynamic conditions,and also their relations with temperature of frozen soil and frequency of cyclic loading.