The representative works at home and abroad on atmospheric angular momentum(AAM) balance since the 1980s are emphatically analyzed in this papar,and angular momentum exchanges between the earth and the atmosphere,angular momentum transfer,and their relationships with mountain torque anomaly,friction torque anomaly,Earth’s rotation anomaly and El Nino and Southern Oscillation(ENSO) etc are summarized.A few aspects that should further be studied are also given.