[en] A generalized two-dimensional analytical model and a computer code POSTCHF for both dispersed flow and inverted annular flow during post-CHF region have been developed. The model was based on the basic two-phase conservation equations and related constitutional correlations. The basic idea and mathematical model are presented. It was concluded from the calculation that the initial droplet size in dispersed flow has strong influence on wall temperature, but the initial film thickness in inverted annular flow has been found less influencing. The Tatterson annular droplet model and the turbulent coefficient C_v = 0.55-0.62 were used with which the results were agreed well with the experimental data