For better understanding the mass transfer and axial mixing characteristics, computational fluid dynamics software (CFX) is used to simulate the single-phase flow in a pulsed-sieve-plate extraction column (PSEC) with three different types of structures, including the standard PSEC structure and two types of coalescence-dispersion pulsed-sieve-plate extraction column (CDPSEC) structures. It was found that the simulation results may explain the axial mixing characteristics very well by comparing them with the experimental data. The simulation results show that the standard PSEC structure is of stable flow fields under different operating conditions. The CDPSEC structure as an improvement upon the standard PSEC structure shows complex flow characteristics and mass transfer performances. The CFD method can be applied to optimize the CDPSEC structure besides the practical experiments and be of the potential to reduce the experimental cost as low as possible.