In order to determine the applicability of FT-IR spectroscopy for quantitative measurement of 7 individual combustion gases of textiles, NH$_3$, CO, $CO_2$, HCl, HCN, NO, NO$_2$, the combustion gas analysis system was equipped with FT-IR spectrophotometer. It is found that each standard gas shows a group of spectral absorption bands consisting of a large number of small peaks in the IR region. Through the comparision between the spectrum of standard gas and that of combustion gas, it was found that each component of combustion gas, except for NO$_2$, has a characteristic spectral range which does not overlap with that of other components.