Since the gas-liquid flow behavior in the pressurized bubble column is highly irregular, random and stochastic, it has been analyzed by resorting to somewhat noble chaos analysis : the resultant pressure fluctuations describing the complex flow behavior of gas-liquid in the system have been manipulated to form the multidimensional phase-space portraits from which the strange attractor can be obtained. The chaos behavior of pressure fluctuations has been represented by means of correlation dimension. The volumetric gas-liquid mass transfer coefficient in the pressurized bubble column has been determined by adopting the axial dispersion model, and the relation between the hydrodynamic characteristics and the mass transfer coefficient has been also discussed. As a result of this study, the correlation dimension of pressure fluctuations has increased with increasing gas velocity(0.02-0.25 m/s), but it has decreased with an increase in the pressure(0.1-0.6 MPa) in the column, representing the dynamic gas-liquid flow behavior in the column. The volumetric gas-liquid mass transfer coefficient has increased with increasing gas velocity and pressure. The gas-liquid mass transfer has been well predicted by means of chaotic behavior of gas-liquid flow in the pressurized bubble column.