In this paper, based on the analysis of seismicity, crustal deformation and other precursory data, the authors indicated that the regional anomalies in the southeast of Gansu Province before and after the Jingtai Ms 6.2 earthquake in 1990 are characterized by small changing speed,a synchronous start time,different mechanics natures reflected by different anomalies,and so on. These accord with the anomalous changes of crustal deformation and seismicity. It is considered that the group anomalies in the southeast of Gansu before the Jingtai Ms 6.2 earthquake are regional precursor of the Gonghe Ms 7.0 and Jingtai Ms 6.2 earthquakes. The sustained anomalies after the earthquake reflected the stress adjustment within a vast area.
The structure conditions in the Southeast of Gansu have their specific characters. The southeast of Gansu likely is one of the common adjusting regions of the sib and the 6th strong earthquake clusters along the North-South earthquake zone.