Abstract: This paper presented that the strong variation of fluid properties in the pseudocritical region would amplify the error of elemental T/H parameters. Firstly, the T/H sensitive analysis of heat transfer coefficient was performed with a typical heat transfer correlation. Then, the wall temperature deviation of two symmetrical thermal couples was discussed in the circular pipe supercritical water heat transfer experiments. It suggests that the pseudocritical fluid properties may alter the circumferential uniform characteristics of the circular pipe and could be the reason for the scatter of the heat transfer correlations.