Abstract: 2092 pieces of data for frictional pressure drop of two-phase flow were collected from 18 published papers of which the working fluids include R123,R134a,R22,R236ea,R245fa,R404a,R407C, R410a,R507,CO₂,water and air.The hydraulic diameter ranges from 0.506 to 12mm;Re_gl from 10 to 37000, and Re_gg from 3 to 4×10~5.11 correlations and models for calculating the frictional pressure drop of two-phase flow were evaluated based on these data.The results show that the accuracy of the Lockhart-Martinelli method,Mishima and Hibiki correlation,Zhang and Mishima correlation and Lee and Mudawar correlation in the laminar region is very close to each other,while the Muller-Steinhagen and Heck correlation is the best among the evaluated correlations in the turbulent region.New correlation based on Chishom method was proposed,which is better than other methods in both laminar region and turbulent region.