Abstract: The dynamical mechanisms associated with the formation and maintenance of Northeastern China Cold Vortex (NCCV) are summarized in this paper: (1) The topography conditions related to the Greater and Lesser Hinggan Ling ranges and the water vapor condition facilitated by the neighboring seas are favorable to the formation and development of the migrating cold vortex system over the Northeastern China; (2) The NCCV circulation may be directly formed due to the downstream energy dispersion of the quasi-zonal low-frequency Rossby waves that are emanated by the upstream blocking-type anomalous circulation over the Eurasian continent; (3) The meridional propagations of Rossby waves from the blocking-type circulation over Northeastern Asia and from the subtropical anomalous circulation are favorable to the maintenance of the NCCV circulation, in particular, in mid- and late summer; (4) the formation and maintenance of NCCV circulation can also be caused by the upward propagation of Rossby waves over Northeastern China, which is forced by the cold air activity in the lower and mid-troposphere associated with the neighboring blocking-type circulation; (5) The effective transient eddy feedback forcing, due to the interaction between the transient synoptic disturbances from upstream regions and the downstream basic fl ow pattern, leads to the persistent maintenance of the NCCV circulation; (6) The western Pacific (WP) pattern is the background downstream basic circulation pattern of the NCCV circulation and its dominance is the primary cause of the recurrence and persistence of the NCCV activity.