The article scientifically examines the origins of the Khitan tribes in the early Middle Ages and various views on this issue in historical sources. It also discusses the early history of the Khitan people and the factors of socio-political events that took place in the Far East at that time. The article also provides a scientific analysis of the scientific considerations put forward by various scientists. This article also contains anthropological, linguistic and other evidence of the origin of the Khitan tribes.Index Terms: migration of peoples, Far East, China, ethnogenesis, Chinese, Liao Empire, Karahitai, eight tribes, three kingdoms of Korea, ethnonym “Tsidan”, chronicles, Sunnu tribal union, Xianbin tribal union, Yuwen, Kumosi, mujun, struggle, Sun dynasty, historian Wuyang Xu, Siberian Mongoloid race, Muslim historians