随着地震观测技术的发展，数字化技术引入地震前兆观测仪器中，由于各种干扰及数字化仪器的自身因素，数字化观测数据有时会出现突升、突降的现象，给数据分析带来不便。本研究引进肖维纳（Chauvenet）准则，从理论上对气体流量干扰数据进行剔除，以便于数据分析。

The digital observation is introduced into the seismic precursor instrument with the development of the seismic observation technology. Sometimes, the digitization data change severely because the interference factor coming  from seismic precursor instrument itself. It becomes difficulty to analyze the interfered data. In this paper, Chauvernet rule is used to remove the interfered data in the gas flow rate data. It makes the analysis of observation data become easy.