地磁相对记录中，雷电干扰在全国范围普遍存在，但其干扰原理尚未明了，给我们仪器的日常维护和数据预处理带来困惑。以蒙城台2009年至2010年两套GM4磁通门磁力仪记录的数据为基础，针对该类干扰现象进行对比分析，对其形成原理进行探索。

关键字：雷电，地磁，干扰，感应雷

The thunderbolt interferes with the relative geomagnetic records,which is common in  our country.But because its principle is not yet clear, we have some confusion in our equipment daily maintenance and data pretreatment . In this paper,we have compared and analyzed the data ,which is from the 2009-2010 records of the results of two sets of GM4 fluxgate magnetometer at Mengcheng Seismostation ,for the principles of the thunderbolt interference.