Abstract: Based on TBB data from Japanese GMS satellite observations, the seasonal cycle features of Asian-Australian Monsoon (AAM) are investigated. The results show that TBB data do reflect the variation of mid-low latitude circulation systems to a considerable degree. It not only reaffirms the former studies on the seasonal progress/retrogress of AAM, but also reveals some new phenomena, thereby deriving an entire picture for AAM’s seasonal cycle. The studies are also made of the formation for TBB bi-low-value-belt near the equator and the characteristics of AAM interannual anomaly revealed from TBB Data.