Immigrants have played an important role in the history of Gogurveo. The maintenance and evolution of ethnic identity is the key factor to understand the relationship between immigrants and the society of Goguryeo. It was the Fuyu(夫余) people who moved in and formed an alliance with the Guilou (桂娄) tribe to shape the memory of their common ancestors, which laid the foundation for the rise of the Goguryeo nationality The ethnic polities such as Woju(沃沮), Dongfuyu (东夫余). Beifuy(北夫余), Hanhu (韩秽) became the vassals of Goguryeo. After the construction of cities and the dispersion of the polities, the above ethnic groups integrated with the society of Goguryeo with the help of the interlinked language and similar culture, which created conditions for the expansion of the territory and population growth of Goguryeo. A large number of people from Central Plains who entered into Goguryeo had integrated into the local society in different ways, such as forming frontier ethnic community, living together with their clan, marrying with those unmarried women or with those who didn't have stable marriage. Some people from different places also congregated in the same area. The speed and degree of their fusion with the mainstream society show different historical features.