八旗制度
The Qing differentiated between Han Bannermen and ordinary Han civilians. Han Bannermen were made out of Han Chinese who defected to the Qing up to 1644 and joined the Eight Banners, giving them social and legal privileges in addition to being acculturated to Manchu culture. So many Han defected to the Qing and swelled the ranks of the Eight Banners that ethnic Manchus became a minority within the Banners, making up only 16% in 1648, with Han Bannermen dominating at 75%. It was this multi-ethnic force in which Manchus were only a minority, which conquered China for the Qing.