Ice-water interface temperature data were collected in the center site (with water depth of 147.5 m) of Nella Fjord near Zhongshan Station from March to November, 1997. The data were obtained by using of 15 sets thermo-sensitive sensors with interval of 15 cm from ice surface to beneath upper water column. The objective is to get the in situ temperature distribution and seasonal changes of sea ice column and ice-water interface. Results indicated that large temperature gradient in the sea-ice column was recorded. The temperature difference between the ice surface and bottom ice can be over 10.