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High sensitive gas detection and spectral analysis have been widely applied in the industrial and safety production.The recent progress made by our group on high sensitive gas detection with technologies of TDLAS,off-axis integrated cavity output spectroscopy (OA-ICOS) and cavity ring-down spectroscopy (CRDS) will be briefly summarized in this report.Some recent works for field applications of industrial hazardous gas emission online monitoring and gas leakage detection in oil tank farm with TDLAS is first presented, and then part of most recent researches on isotopic gas detection with OA-ICOS and CRDS for tracking of pollution sources, resources exploration are also introduced.