利用IGS(国际卫星定位导航服务组织)提供的GIM数据对2013-04-20发生的Mw7.0芦山地震震区上空电离层信息进行了研究。选取震中附近格网点进行包络线法异常分析及通过绘制全球电离层异常图来分析异常。通过分析发现，震前存在明显的电离层异常，在4月14日即震前第6天存在异常；异常区域沿着赤道共轭分布，不断移动。通过分析地磁指数、太阳活动水平等信息量，发现电离层异常与地震有较明显的关系。%IGS GIM data is used to analyze ionosphere information of Mw7.0 Lushan earthquake on April 20, 2013. The grid points near the epicenter are selected to analyze by the envelope method and draw abnormal global iono-spheric anomalies map. The analysis results show that there are obvious ionospheric anomalies on 14th April which is six days before the earthquake. The abnormal conjugate area is distributed along the equator and constantly mov-ing. By analyzing geomagnetic indices, solar activity level, etc, it shows that ionospheric anomalies and earth-quakes have a significant relationship.
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