Shandan geo-electric station is only 43 km from the epicentre of Minle-Shandan M_S6.1 earthquake in 2003. The electric variations precursor is obviously recorded at the station during the one year and short-term period before the earthquake, which is the typical precursory electric variation in or near the focal region in the late preparation period of strong earthquake. But the anomalously electric change does not appear in impending period. The main reason is probably the direction of pressure stress in seismic stress field and the station orientation to the event, according to the special relation ship among the imminent anomaly, focal site, active fault and the causative mechanism.