Abstract: Due to technological reasons, the waste power plant will store a large amount of garbage in the leachate channel and garbage silo for storage and fermentation to produce combustible/toxic and harmful gases. The detection equipment is easy to be blocked and damaged, and at the same time, the maintenance and overhaul times of personnel entering the garbage warehouse are reduced. Compared with the existing installation conditions, the proposed extraction-type detection of combustible/toxic and harmful gases is more reliable and stable. Based on the consideration of the working environment of personnel, personnel do not need to enter the garbage warehouse, eliminating major safety hazards. The extraction-type flammable/toxic and harmful gas detection method is adopted, which effectively controls the influence of the flammable/toxic and harmful gas detection device by the harsh environment, and prolongs the overall life of the system. In addition, the proposed extraction-type combustible/toxic and harmful gas detection method can effectively reduce the installation quantity of electrochemical analysis probes and realize cost reduction.