Abstract: Northeast Asia is one of the most complex areas of plate tectonic activities in the world. The eastern continental margin accretion zone involves two types, i.e., collisional orogenic belt and accretionary orogen belt. The western margin reactivation zone contains Eastern Siberia ancient land reactivation region (north), East Mongolia-Xing'an-Jihei reactivation region (middle), and eastern Sino-Korea ancient land reactivation region (south). The overall structural framework of the Northeastern Asian Mesozoic active continental margin is characterized by zonation from east to west, segments from north to south, and development from northeast to south. The late Middle Jurassic-early Early Cretaceous sedimentary-volcanic-sedimentary molasse in North China-Mongolia-Xing'an Region, which is a component part of the Northeast Asian Mesozoic activite continental margin in its evolutionary process, is one of the indicators of tectonic system transition.