To quantitatively investigate multicomponent gases evolved by continuous or overlapping thermal reactive processes, a method to determine evolved rates of multicomponent gases was developed from temporal infrared functional group profiles using a combined system of Thermogravimetry and Fourier transform infrared (TGFTIR). The influence of flow rates of carrier gas on quantitative calculating results of multicomponent gas products was discussed by taking example for the gases such as carbon dioxide, carbon monoxide, and sulfur dioxide evolved from soot and oxygen reaction. The calculation results indicate that the loss of reactive gas and the occurrence of trace gases products during thermal reaction can be ignored with appropriate flow rate of carrier gas for determination of the evolved rates of multicomponent gases products. An approximate quantitative method can be used to identify quickly the evolved rates of gases when some components weakly or even do not absorb infrared energy during thermal reaction process．
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