Abstract: According to fluctuation theory, considering soil nonlinearity, earthquake response spectrum answer is obtained. By using plane stratum earthquake response equivalent linearization program, earthquake response spectrum is calculated with different temperature and different overlay thickness on permafrost site and seasonal frozen soil site. It indicates that temperature has great influence to earthquake response spectrum on permafrost site, its acceleration peak value decrease and move forward with the temperature decrease, site predominant period decrease either; its value increase first and then decrease with the overlay thick increase; earthquake response is greater in summer than that in autumn, but it also has the results in reverse in short period.