Abstract: A visualized investigation was performed to study the condensation process of a single vapor bubble under high subcooling conditions. The obtained experimental data were compared with the existing correlations. Experimental results show that a liquid jet will form at the bottom of a vapor bubble with high velocity after its detachment at high subcooling, which accelerates bubble deformation and condensation process. In addition, the existing correlations are not able to predict the condensation dynamics of vapor bubble at high subcooling very well, and the relative errors exceed 50% at the end of condensation. Further, the sensitivity analysis was performed with Sobol model to analyze the existing correlations, and the impact of Reynolds number, Jacob number and Prandtl number on bubble condensation process under different conditions was evaluated quantitatively.