Various kinds of geophysical data are steadily increasing around the Antarctic Continent. However, increase rate is not so high due to severe environmental conditions such as bad sea state. Especially, heat flow data are one of the most lacking geophysical parameters. Concerning heat flow measurements in the southern ocean, contribution of Japanese R/V Hakurei is substantial. During the past two decades, R/V Hakurei has made circum Antarctic research cruises. In this paper, we summarize R/V Hakurei's heat flow data and the general feature of heat flow distribution around the Antarctica.