In this paper, the author reviews the process of the Mandolin-shaped Bronze Dagger’s appearance and its background. The data thus far shows that the Mandolin-shaped Bronze Dagger appeared in the East-West Belt of the Liaohe River Plains, connecting the Liaoshi with the Liaobei regions, around the middle of the Western Zhou Period. The advent of the Mandolin-shaped Bronze Dagger in the Liaoning region is related to culture changes that took place around the Liaohe River, namely the technological and ideological background of the bronze weapons of the early stage of the Upper Xiajiadian Culture. It should be noted that a parallel existed, for a certain period of time, between the Upper Xinle Culture of the Liaohe River Plains and the Shuangfang Culture of the Liaodong Mountain Region. Of course, it is likely that the first appearance of the Mandolin-shaped Bronze Dagger in the Liaoning area was earlier, given the chronology of the Korean Bronze Age Culture. However, it is not reasonable to push back the chronology without considering the context of culture change or the technological and ideological background of the bronze dagger s manufacture in the Liaoning area. In the process of appearing in the ‘East-West Belt of the Liaohe River Plains’ and spreading southward, the Mandolin-shaped Bronze Dagger may have undergone different processes of establishment, depending on the region, in conjunction to the rebuilding of the indigenous culture.