Abstract: The knowledge of rapid climate changes is one of the recent achievements in global climate researches, and an example is the millennial climate oscillation in the last glacial stage. It is important for us to predict future climate after understanding the character and mechanism of climatic changes. It has been revealed that millennial-scale climate variability is a global phenomenon, which was not limited to the ice cores and high latitudes of the North Atlantic, but extended to other oceans such as the tropical Pacific and other parts of the globe. The tropical seas play an important role in the global climate changes, especially in the millennial climate oscillation. The super ENSO is possibly the source of this oscillation. There are also records in South China Sea, and it is an ideal place for scientists to do researches on the regional response and mechanism of the global changes.