In 3 16, the western Jin dynasty was destroyed. The following year, Si Marui of the Western Jin Dynasty re-established the political power of the Han landlord class in the south of the Yangtze River, and established Jiankang as the capital, which was called the Eastern Jin Dynasty in history. At that time, political power established by more than a dozen other nationalities appeared in the area north of the Yangtze River. Han historians wrote in the history books that this period was called the "Sixteen Kingdoms" period. In the 1970s, Fu Jian, the imperial clan, established the Qin Dynasty, which was named "Pre-Qin" in the history books compiled by Han historians, which unified the Yellow River basin and formed a situation of confrontation between the north and the south in the pre-Qin period.