Abstract: Pulsed corona discharge plasma was used to treat ethanethiol in the air. The influences of gas flow rate (or residence time) and moisture of gas flow on removal efficiency were investigated. As a result, the removal efficiency decreased obviously with increasing gas flow rate, because both the residence time of ethanethiol in plasma reactor and energy density decreased. While the variation of removal efficiency with moisture on removal efficiency was not increasing or decreasing unilaterally, and the maximal removal efficiency could be obtained in a range of moisture. The removal efficiency in the moisture range of 3.2—3.5 g/m³ was obviously higher than that at a moisture of less than 3.2 g/m³ or more than 3.5 g/m³ according to experimental data. The products of ethanethiol reaction were mainly CO₂, H₂O and SO₂ analyzed by GC-MS, FTIR and SGA94-SO₂ Single Gas Analyzer, but no organic product was found. According to analyzing the reaction kinetic characteristics of ethanethiol based on experimental data, it was found that the reaction of ethanethiol in pulsed corona plasma system followed the first order reaction, with the reaction rate constant of 0.0729 s^-1.