Abstract:Historic earthquake activity in Qinghai has been analyzed by the time symmetry based on the 17 times historical seismic data of Qinghai,and predicted the time of the future earthquake occurrence and provided the basic reference for earthquake monitoring in Qinghai.Based on the method of ternary,quaternary and quintuple commensurability,this paper analyses the earthquake whose magnitude is more than 6.0 in nearly 40 years.The results shows that in the next 10 years,2015,an earthquake with magnitude equal to or more than 6.0 is more likely to happen.