Experiment is conducted to study The heat characteristics and moving regulation of phase change interface in the progress of water flowing along icicle under forced and mixed convection The mapping relationship between the experimental data and the heat transfer coefficient in phase change interface of icicle is established. With various initial dimensions of icicle, initial temperatures in icicle, velocities and temperatures of water, moving regulation of phase change interface of icicle is recorded using industrial cameras The results show that, The variation trend of each location of phase change interface is similar with different velocities, and the location of phase change interface decreases with time in a form of power function; the average convective heat transfer coefficient increase over time with the increase of velocity and temperature of water,with different velocities and temperatures of water, at first Nu increases steadily with Gr/Re 2, however it witnesses a fall trend after reach to the peak point. Empirical correlation ofNu、 Gr、Re、Prand Ste is established.