处理、分析榆树地震台自建台以来2 604天的地电场分钟值数据，结果表明：①该台地电场正常的日变化曲线形态呈现典型的“双峰单谷”变化；②地电场分钟值曲线峰谷极值时间与本地日出和日落时间吻合；③地电场观测记录的短周期信号（小于1 h）受观测环境的影响较小；④在中强地震前，能够捕捉到明显的异常信息，等等。

In this paper, the minute value data of geoelectric field at Yushu Seismic Station in 2 604 days since the station has constructed are processed and analyzed, the results shows that :①The typical daily change of the geoelectric field observed at Yushu Seismic Station is double peaks and single valley；②The time of peaks and valley extremum for curve of minute value of geoelectric field coincide with sunrise and sundown in local area；③The influence is smaller in short period signal（less than one hour）by observation environment of geoelectric field ；④The evident abnormal information were caught before middling and strength earthquakes, and so on.