1． Yushu Seismostation，Yushu 130400，Jilin，China; 2． College of Geo- exploration Science and Technology，Jilin University，Changchun 130026，China; 3. Siping Seismostation，Siping 136000，Jilin，China

Pre- earthquake geoelectrical resisitivity anomalies of deep source and shallow source earthquakes in Jilin Province have been abstracted by morphological method，normalized rate change method and degree of anisot- ropy method． The results show that ①pre- earthquake geoelectrical resisitivity displayed 1 ～2 years mid- term anomaly，even short- term anomaly with mainly negative anomaly; ②the original monthly mean of anomaly variation am- plitude of pre- earthquake geoelectrical resisitivity less than one percent，showing the increases of captures signal sensitivity by digital geoelectrical instrument，which inextricably links with the sandstone bedrock structure beneath stations; ③anomalous variation existing in pre- earthquake geoelectrical resisitivity and recovery to normal morpholo- gy after earthquakes，reflecting the change of stress in underground epicentral area before earthquakes，and the re- turn and restoration process of regional tectonic stress field after earthquakes．