The porous polymer beads of styrene divinylbenzene copolymer (GDX203) were nitrated by different proportion of HNO3(65％)-H2SO4(98％) mixture at room temperature．The nitrogen content and nitro-group were confirmed with elementary analysis and IR spectrum．The modified GDX203 was used as chromatographic stationary phase for analysis of carbonylation products of methanol．The optimum gas chromatographic stationary phase was selected from modified GDX203 0f different nitrogenous contents．The results showed that by using a modified column of proper nitrogen content all components in the reaction medium were separated at constant chromatographic temperature

especially CH3COOCH3 and CH3I can be separated completely．The gas chromatographic analysis of five components was accomplished in 6 minutes．