Heilongjiang was developed by mainland immigrants. Before the establishment of the Qing Dynasty, the Black Dragon Sword was in a relatively primitive and underdeveloped state, and the birthplace of the Qing Dynasty was mainly Jilin and Liaoning. After the founding of the Qing Dynasty, the first large-scale immigration was the flag bearer who set out from Beijing. Due to the population pressure in the capital area and the political struggle between Manchu and Qing factions, many flags were transferred to the three northeastern provinces, which increased the development of this area.
Although Heilongjiang is the focus of immigration, Dalian is also one of the main areas, so Dalian's accent has changed a lot, and all of them speak Mandarin of the Qing Dynasty. The Dalian accent also absorbed many native pronunciation skills, and was more integrated with the Northeast dialect, forming an accent system independent of the Northeast dialect. The Qing dynasty never stopped developing Dalian, including immigration and diaspora, which were all policies to accelerate immigration.
In the late Qing Dynasty and the early Republic of China, it was the choice of many bankrupt farmers. The influx of a large number of people into Northeast China has also brought unique accents from all over the country. As a port city, Dalian is still attractive to immigrants. Moreover, since modern times, military disasters have occurred frequently in Jiaodong, and the population outflow has become more serious. As a port city, Jiaodong people prefer Dalian. During this period, Dalian developed rapidly, and the number of people absorbed exploded. It is likely that Jiaodong immigrants dominated the process of accent change and finally established a unique accent system. Moreover, the Jiaodong language family already includes Jiaodong and Liaodong, and Liaodong originally belongs to the northeast.