With the accumulation of observation data and the popularization of geomagnetic harmonic amplitude ratio method

plentiful geomagnetism harmonic amplitude ratio abnormal earthquakes have been recorded in recent years

but it is difficult to identify geomagnetic harmonic amplitude ratio anomalies.However

the deformation rate accumulation method is easy to determine anomalies and extract abnormal indexes by integral of abnormal data.On the basis of this situation

total 12 time-series curves of geomagnetic harmonic amplitude ratio are calculated using the geomagnetic minute data from January 2013 to December 2017 at Linfen

Huangyuan and Chengdu station.Then the rate accumulation method is used to calculate the results in each period of magnetic harmonic amplitude ratio in the north-south direction and the east-west direction.Six time-series curves of rate accumulation in each cycle are obtained.The results show that:（1）anomalies are distinguished by the geomagnetic harmonic amplitude specific rate accumulation method at Linfen

Huangyuan and Chengdu station before the 2016 Yuncheng 4.4 earthquake in Shanxi Province

the 2016 Menyuan 6.4 earthquake in Qinghai Province and the 2017 Jiuzhaigou7.0 earthquake in Sichuan Province

respectively.The anomalies are as follows:at least 2 of the 6 rate accumulation curves（6 cycles）show continuous decline or level fluctuation for more than 1 year（continuous rise is normal）;（2）the rate accumulation method is easier to identify the abnormities in geomagnetism harmonic amplitude ratio data and is more accurate in abnormal characteristics statistics.The results are basically consistent with the original geomagnetism harmonic amplitude ratio anomaly discrimination results.