Abstract: Taking the fire-flooding pilot test area in Wellblock Hongqian-1 of Hongshanzui oilfield, Junggar basin as an example and on the basis of data analysis of field gas component monitoring, whether the reservoir is ignited and is in a high-temperature combustion state can be rapidly determined. In view of no effective front-line monitoring technique up to now, the article proposes a new method by which the air distribution can be verified on the basis of data analysis of gas component monitoring. The result can be used to provide basis for production performance adjustment of fire-flooding and to identify abnormal status of production wells in time. The re-understanding of H2S variations during in-situ combustion process in Wellblock Hongqian-1 can provide data for surface engineering planning during the industrilization of fire flooding