According to the increase of greenhouse gas in the atmosphere such as carbon dioxide, it is suspected that global warming would be proceed and abnormal weather would be frequently occurred. Abnormal ocean conditions such as decease of the Arctic sea ice or the temperature rise in the deep seas, would be occurred in the global ocean, too. In our ocean climate laboratory, concerned researches on the global ocean climate variability and global ocean circulation change are carried out through the global analysis of sea level change and water temperature. For the researches, in-situ oceanographic observation and analysis are also carried out by our training ship "Seisui-Maru" of Mie University. Further numerical model experiment on the ocean circulation, and re-analysis of the archived oceanographic data in the JODC are also tried. Let's start to study the global ocean climate change with us for the sustainable ocean and earth.