Abstract:Primary analysis and discussion on some typical earthquake precursor anomalies which appear in the range of 500 km are done according to the data recorded by the RZb-1 type digital strain gauge with high precision and broad channel.The results show that though there are some differences on the observed curve anomaly forms before the earthquake,there also exist some same characteristics such as solid tide distortion,strain rate increase,impending earthquake abrupt anomaly,strain step,etc.According to these characteristics,authors predicted the earthquakes,for example,the Hejing MS5.7 earthquake on Feb.3,1993,the Ruoqiang MS6.6 earthquake on Oct.2,1993 and the south Shaw an MS 5.4 earthquake on Jan.9,1996.