采用地磁加卸载响应比方法，对云南地区的数字化地磁垂直分量（Z）日变幅值进行计算，研究2009年1月—2013年3月以来云南地区发生的8组M_S≥5.0地震前的异常变化。结果显示，加卸载响应比值出现高值异常对云南地区短期内发生M_S5.0以上地震有一定的指示意义，尤其是M_S5.5以上地震，对应效果较好。初步分析了云南地区数字化地磁资料异常的时、空、强特征。

 Calculated the data of daily amplitude variation(ΔZ) of digital geomagnetic vertical component(Z) in Yunnan area with the method of geomagnetic loading-and-unloading response ratio; Studied the anomaly changes before the 8 earthquake cases with M_S≥5.0 in Yunnan region from January 2009 to March 2013. The results show that, the anomaly high value of response ratio has certain instruction significance to impending of earthquake with M_S≥5 in the short term in Yunnan area , especially the impending of earthquakes with M≥5.5.Analyzed the abnormal characteristics with time、space and strong of digital geomagnetic data in

YunNan region.