研究了大地电场变化的基本要素,对嘉峪关地电场观测资料的质量进行了评价和分析,得到:嘉峪关台地电场观测基本反映了地电场的真实变化,特别对大地电场变化的记录准确。并研究了嘉峪关台附近及周围发生的4次中强地震前地电场、大地电场短临前兆现象,认为震前都显示了一定的短临异常。 The basic elements of the change of geoelectric field are studied. The quality of the geo-electric field observation data of Jiayuguan is evaluated and analyzed. The results show that the observation of the geo-electric field in Jiayuguan basically reflects the true changes of the geoelectric field, especially the accurate recording of the change of the geoelectric field. The geoelectric field and geoelectric field precursory anomalies before 4 moderate earthquakes occurred in and around Jiayuguan station were studied. It is concluded that some short-term anomalies were observed before the earthquake.