The Problem of the accelerational and frictional pressure drops of cryogenic two-phase flow in a horizontal tube is studied. The homogeneous model is used for analysis. On the other hand, the data of accelerational and frictional pressure drops are derived from the experiment of boiling nitrogen experiment by D. Steiner et al. and are compared with the theoretical analytical results. The research shows the effects on the pressure drorp ratio of the heat flux, the pressure, the mass flow rate, and the vapour quality, and gives an applicable range of the homogeneous model.