四世纪初,西晋中央政权衰弱,中原战乱、饥荒频发,特别是永嘉以来,五胡乱华,各内迁胡族先后建立政权,北方大族纷纷携宗族部曲南渡,而一些未南迁的士族,则流寓北方。流向东北者,托庇于鲜卑慕容氏政权之下。流向西北者,归依于凉州张轨的领域。~([1])慕容廆则抓住时机,“虚怀引纳,流亡士庶多襁负归之”。~([2]) At the beginning of the fourth century, the power of the Central Government in the Western Jin Dynasty was weak, the Central Plains war and famines were frequent, especially since Yongjia. Family, then flows to the north. Flow to the northeast, to take shelter under Xianmi Murong’s regime. Flow to the northwest, depending on the field of Liangzhou track. ~ ([1]) Murong Xi seize the opportunity, “Hypocritical Admittance, Exiles were mostly Shu ”. ~ ([2])