There are many disadvantages in the system of selecting scholars in Han dynasty: First, the system of selecting scholars in Han dynasty takes wealth as the main condition and obtains the qualification for selection by virtue of its own wealth. Second, during the Western Han Dynasty, officials were dismissed because of election fraud. Since the reign of Emperor Guangwu, he has sent letters to YEATION for many times, and even proposed to punish the false candidates. At the beginning of Ming Di's accession to the throne, the next imperial edict pointed out: Please entrust the right door election, officials are greedy for mistakes, and the people are worried and heartless. By this time, Chazhou had been controlled by county officials. In the imperial edict promulgated by Zhang Kaiguo in the Yuan Dynasty, it was pointed out that the name selection was not true, and it was given to a hundred-year-old, but it was given to political power without doing it, and it was important to family status without seeking merit. Third, during the reign of Emperor Ling, it was quite common for eunuchs to monopolize power and ask for help. In order to cultivate their own power, they have to support their own party followers, "make friends without practical learning", and even openly and popularly "fight for goods while worshiping the door".