Abstract: This paper briefly introduced the geo-electric field-testing station array, composed of Baodi, Jinghai and Xuzhuangzi earthquake stations, then analyzed its observation data in the aspect of simultaneous changes, daily change, correlation and etc. The result indicates that: ① The typical daily change data of the telluric field are observed at all stations, and it is characteristic of double peaks (valleys). ② The observed data at each station show somehow synchronous changing, the range of the daily change of each station related the underground medium electricity, and the phase change may be related to its environment. ③ Before the Wen′an M_S5.1 earthquake in Hebei Province, occurred on July 4, 2006, it was found that the short period signal (less than one hour) had added in the observation data of the Jinghai station, and different from other′s. ④ The method of short period (hours) correlation analysis could be one of the reference approaches in the application, both evaluating the simultaneous change of regional telluric field and identifying the information of non-background changes.

Key words: Geo-electric field, Station array, Data analysis