Abstract: In order to improve the hydrate separation effect of high concentrated CO2gas, the paper studied the hydrate separation process with three high concent ration CO2gas under the condition of different concentrated tetrabutyI ammonium bromide ( TBAB) , the concentration was 0.2 ~ 0. 8 mol/ L). In combination with the analysis results of the gas chromatography, a calculation and analysis were conducted on the CO2recovery rate and the separation factor. The results showed due to th e TBAB hydrate formed semi-cage structure could provide the physical base for CO2, the hydrate phase CO2concentration would increase with TBAB concentration incr eased under the range of certain TBAB concentration. But the TBAB concentration too high would affect the solbility of CO2in the liquid phase, would restrain the form ation of the CO2hydrates and could reduce CO2recovery rate. The higher CO2concentration in the raw gas material, the more CO2concentration flled in 512drasy cavit ies would be and the separation factor in the TBAB system would increase with CO2concentration in the raw gas material increased. When CO2concentration was low, t he TBAB added would affect purification degree of the CO2hydrate separation.