This study examines the meaning of the abolition of Dongnyeongbu in 1290 and the return of Goryeo in the Bukgye region. The contents of this study are as follows. First, Dong-nyeong-bu was established for the stable stationing of the Yuan’s army, which had been deployed in the Bukgye area since 1269. This function is related to the geographical advantage that the Northern Territory region as a traditional military zone of Goryeo can quickly respond to the business of Goryeo and Japan while checking the possibility of the separation of Goryeo. Therefore, it can be said that the Dong-nyeong-bu was an instrument that supported the functions of the Bukgye region. Second, Kublai did not allow the Yuan troops stationed in the Northern Territory to move south. This suggests that Dong-nyeong-bu was not the only encroaching existence of the Goryeo dynasty. In other words, Dongnyeong-bu was the opening site of Garrison farm, which was deployed in the Goryeo area, and was a rival to Goryeo in its nature, but at the same time, it was also an opponent who shared and shared the burden of war with Goryeo. Third, in the process of preparing for the second Japanese expedition, it is related to the establishment of a unified command system, such as when King Chungnyeol ascended to the throne of Jeong-dong-hang-seong and absorbed the military power of the commander-in-chief. The military function of Dongnyeongbu as the hinterland of the former Dong-dong-won-soo-bu was also absorbed and integrated into Jeong-dong-hang-seong. Fourth, not only the encroachment on the infrastructure in Dong-nyeongbu, but also the power structure in Dong-nyeong-bu was made extensively. In the end, the abolition of Dong-nyeong-bu and the return of the Goryeo Bukgye region can be understood as the absorption of the assets and functions of the Dong-nyeong-bu, not merely the return of the territory.