CS2 gas is not only an atmospheric odor pollutant,but also a crucial characteristic gas for fault diagnosis of Gas Insulated Switchgear.However,the temperature change in the detection environment directly affects the accuracy of the monitoring data.The paper uses CS2 gas to have noticeable characteristic absorption characteristics in the ultraviolet band.Continuous light sources and differential absorption spectroscopy techniques are utilized to monitor different concentrations of CS2 gas at different temperatures.The inversion of the CS2 gas concentration is carried out by the least squares method,and the inversion result is subjected to least squares fitting to obtain a temperature compensation formula.The experimental results show that the UV differential absorption of CS2 gas decreases with the increase of temperature into a quadratic curve,resulting in a gradual increase in concentration error.This is particularly noticeable when the gas concentration is low.The temperature compensation formula is used for the measurement of the actual concentration,and the error of the experimental concentration was reduced to within 5% from the maximum 17% before compensation.