利用电磁波扰动理论，研究汶川5·12大地震前，金河、剑阁、二砂3个台站的电磁波异常变化特征。结果表明： ①震前3个台站均出现电磁扰动异常，以金河、剑阁地震台显著；②电磁扰动前兆异常在时间进程上有明显的阶段性变化；③随距震中距半径的增大，电磁扰动值逐步衰减。

Using the theory of electromagnetic disturbance, we analyzed the anomalous characters of electromagnetic disturbance observed at Jinhe, Jiange and Ersha seismic stations during the Wenchuan MS 8.0 earthquake. The results show that, firstly, the electromagnetic disturbance of three stations all appears anomalous character before earthquake. It is especially obvious at the Jinhe and Jiange seismic stations. Secondly, electromagnetic disturbance anomalies have clear stage change before the earthquake. And thirdly, the farther the distance of epicenter is, the smaller the electromagnetic disturbance intension.