Abstract: C1~C4 light hydrocarbons can be well separated by Al2O3 capillary column according to the difference of adsorption-desorption ability. It is recognized that there are irreversible adsorption for some light hydrocarbons in some extent, influencing the accuracy of Al2O3 capillary column analysis results. The irreversible adsorption of light hydrocarbon components on different type of Al2O3 capillary column was studied. Several column operation conditions, such as column temperature, carrier gas flow rate and sampling amount, were investigated quantitatively. The results show that the irreversible adsorption is obvious mainly for alkadienes and alkynes, especially for propadiene, 1,2- butadiene and propyne on S and M type Al2O3 capillary columns. The column temperature and carrier gas flow rate have a remarkable effect on the irreversible adsorption and the sampling amounts have no influence on it. The experimental correction factors detected are higher than that of theoretical correction factors for some alkadienes and alkynes because of the irreversible adsorption, so the accuracy of quantitative results can be ensured only by calibration area normalization method.