The Han dynasty especially liked to be the uncle and grandfather's father-in-law of the people around him. For example, King Wusun said that he was the grandson of Emperor Gaozu Xuan Di, and Qiuci also said that he was related to the Han Dynasty. Due to the lack of national strength in the early Han Dynasty, it was at a disadvantage in the battle with Xiongnu. Therefore, for the sake of border peace, a pro-marriage policy was implemented, that is, Emperor Wu of the Han Dynasty married a royal woman or maid-in-waiting to Hun Khan in the name of a princess. This is a temporary measure. After the continuous attack on the Huns in the period of Emperor Wu of the Han Dynasty, it is no longer necessary to practice kissing. But at that time, due to the discovery of the western regions, Emperor Wu of the Han Dynasty also married the princess of the Han Dynasty to the king of the western regions in order to win over and control. Later, the Huns also split. In order to win over the Southern Xiongnu, the Han Dynasty also married the princess to Shan Yu of the Southern Xiongnu. These are all means for the Central Plains Dynasty to control the surrounding ethnic minorities.