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简要介绍了断层气CO2快速测定法的特点，分析了近7年来在怀来后郝窑断层气CO2观测点测得的9个4级以上地震的CO2前兆异常特征。张北-尚义地震前47天，断层气CO2出现突升异常，异常峰值是背景值的10倍左右，据此在震前12天对这次地震提出了较好的短临预报意见。
This paper briefly introduced the characteristics of the rapid determination method of the fault gas CO2 and analyzed the precursory features of CO2 precursors of 9 earthquakes of magnitude 4 or above measured in the past 7 years at the HAO kiln fault gas CO2 observation point. On the 47th day of Zhangbei-Shangyi earthquake, the abrupt rise of the atmospheric CO2 occurred with an anomalous peak about 10 times the background value. Therefore, a short-term and short-term forecast of the earthquake was proposed 12 days before the earthquake.