岫岩-海城5．6级地震前半年内，先后出现了义县地电阻率、台安地电阻率异常变化，这些异常信息也是该次地震成功预报的重要前兆判据之一．研究认为，震前的义县、台安地电阻异常属于“场兆”，而临震前的电磁辐射信息是“源兆”．同时，电阻率的异常变化显示出向震中迁移的特点． During the first half of Xiuyan-Haicheng M5.6 earthquake, the resistivity of Yixian and the resistivity of Taian were abnormally changed, and these anomalous informations were also one of the important precursory criteria for the successful prediction of the earthquake. The study shows that the resistance anomalies in Yixian and Taian before the earthquake belonged to “field trillion”, while the electromagnetic radiation information before the earthquake was “source trillion”. Meanwhile, the abnormal change of resistivity shows the characteristics of migration to the epicenter.