Shang Yang in Qin Dynasty reformed and rewarded the army, and divided the title into twenty grades, while the Han Dynasty inherited the Qin system, which was also twenty grades. They are: 1. Male scholar; Second, build on this basis; The third is embarrassing; Fourth, not much; Fifth, doctors; Sixth, official doctors; Seventh, public doctors; Eight, public transport; Nine, five great men; X. Zuo Shuchang; Eleven, the right elder; Twelve, left more; Thirteen; Zhong Geng; Fourteen, right more; Fifth, build less; Sixteen, big creation; 17. Conductor; Eighteen, big aunt; Nineteen, Shanhaiguan pass; Twenty, behind the car. Its highest level is called the back of the car. Later, because he avoided Emperor Wu of the Han Dynasty, he was changed to Tonghou, equivalent to a vassal in the Warring States period, and later changed to Liehou. "The history of the later han dynasty. "Five Notes on Baiguan": "Liehou ... those who have made great contributions eat the county, and those who have made little contributions eat the township pavilion." It means that those who live in counties, townships and pavilions in Liehou are called county, township and pavilion. However, during the Three Kingdoms period, due to the war, titles were often given titles without titles. Generally speaking, it is a reward for military generals. There are several families in the food city who have the right to collect rent according to the regulations. Guan Yu's lowest Han Shou is Hou Ting's highest rank-Hou Ting.