Abstract: A multi-dimensional two-fluid model for two-phase flow across bundles is presented.The concept of porous media and distributed resistance are applied to derive the two-fluid Navier-Stokes equation of equivalent continuum,which is discretized with full implicit scheme on multi-dimensional staggered grid and solved with direct Strong Implicit Procedure（SIP）.A numerical simulation of kettle reboiler experiment is implemented for model verification.Good agreement between the numerical results and experimental data is obtained,which proves that the sugguested model is able to handle with two-phase instability numerically and suitable for the simulation of multi-dimensional two-phase transient flow across bundles.