The atmospheric precipitation data of three seismic stations, Fengtai of Beijing, Dingxiang of Shanxi Province and Changli of Hebei Province, are studied using the moving average method for monthly means and the subordinate function method. The results indicate that there exist obvious medium-term and mid-short-term atmospheric precipitation precursory anomalies before the earthquakes. Furthermore, these anomalies are well consistent with precursory anomalies of water level, water radon and ground deformation. The atmospheric precipitation anomalies are related to the occurrence time of earthquake and can be used for medium and short term prediction of earthquake, its predictive period is about 4～14 months.oft-com:office:office" />