Abstract: For further understanding the heat transfer mechanisms of supercritical water under the designed parameter range of SCWR, heat transfer characteristics of supercritical water in a vertical upward circular tube were studied through experimental and numerical simulation. The accuracy of the existing correlations and CFD models was evaluated by the experimental data. Through the comparison of wall temperature between experimental data and correlations calculated results, we find that most of the correlations, calculated result can fit well with experimental data. The evaluation of CFD models show that SST and RNG k-ε model can predict the wall temperature distribution qualitatively under experimental condition.