八旗制度
The Qing differentiated between Han Bannermen and ordinary Han civilians. Han Chinese who defected up to 1644 and joined the Eight Banners were made bannermen, giving them social and legal privileges in addition to being acculturated to Manchu culture. Han defected to the Qing and swelled the ranks of the Eight Banners so much that ethnic Manchus became a minority, constituting only 16% in 1648, Han Bannermen 75%, and Mongol Bannermen making up the rest.