The pre-Qin Dynasty, founded by the Di nationality, took Wang Meng, the Han nationality, as the prime minister in Fu Jian, and became strong, unifying most parts of the north. In 383, Fu Jian led an army south, with a huge momentum, in an attempt to wipe out the Eastern Jin Dynasty in one fell swoop, so the famous "Battle of Feishui" happened in history. The battle of Feishui took place at the foot of Bagong Mountain on Feishui God. The ancient city of Shouxian, Anhui. Feishui is also Feishui, which comes from Jiangjun Mountain between Feixi and Shouxian. In the Eastern Jin Dynasty, Xie Shi and Xie Xuan defeated Fu Jian. The battle under the water between the former Qin Dynasty and the Eastern Jin Dynasty is a famous example in Chinese history. There are idioms such as jittery, nervous, and beyond the reach of the whip. After the Battle of Feishui, the former Qin Dynasty collapsed, the north was in chaos, and it was once again in a state of long-term division, and the Hu people had no time to invade the south. In the Eastern Jin Dynasty, the weak prevailed over the strong, and the situation was temporarily stable.
During Yongjia (307 ~ 3 12) in the Western Jin Dynasty, a branch of the Qiang nationality, led by the rich Tusi Yao, moved from Chiting (now Longxi, Gansu) to □ Mi (now Qianyang Cave, Shaanxi). During the post-Zhao period, Shi Hu moved the heroes of Guanzhong, Bian and Qiang to Kanto. In 333, Yao was appointed as the governor of Xiqiang, and led tens of thousands of Qiang people to the source of Qinghe River (now the northeast of Zaoqiang, Hebei Province). After Shi Hu's death, Yi Zhong sent an envoy to the Jin Dynasty, where he got an official title. In 352, Yi Zhong died of illness, his son Yao Xiang succeeded to the throne, and the relationship with the Eastern Jin Dynasty broke down. Yao Xiang wants to lead many people back to Guanzhong. In 357, he fought against the former Qin Jun in Sanyuan and was defeated and killed. Yao Chang, Xiang's younger brother, led troops to the former Qin Dynasty and became a general of Fu Jian with outstanding achievements. Shortly after the Battle of Feishui, Fu Jian returned to Chang 'an, and Murong Hong, a noble of Xianbei, rose up against Qin. Yao Chang participated in fighting for Hong's defeat and fled to Weibei. He got the support of the Qiang people and the nobles of the Western Zhou Dynasty, and also rose up against the State of Qin. In 384, he often called himself a general, Khan, the king of Qin for ten thousand years, and was called the late Qin in history. Yao Chang led the army into Tunbei (now Yaoxian County, Shaanxi Province), and more than 100,000 households in Weibei Hu Qiang joined the army. His power developed rapidly. In 385, Fu Jian was captured and killed. When Murong Yong led more than 300,000 people from Xianbei to the Middle East, Yao Chang entered Chang 'an and proclaimed himself emperor in 386, with the title of Daqin.