Basic condition of geotemperature observation of Chang ping seismic station and normal change of geotemperature by the station are introduced.Characteristics of anomalous geotemperature change before some earthquakes are analysed.The results show there are 9 ones to correspond to earthquakes occurred in a range of 300 km distant from Changping station among 11 anomalies in geotemperature data by the station since 1995.Anomalous shapes before earthquakes near by and distant the station are trend drop-rise and sudden jump respectively.The larger the anomalous amplitude and the longer the quiet time,the larger the magnitude of coming earthquake.The anomalies in geotemperature data observed once a minute are more obvious than that observed once an hour.