世僕制，係一個源自封建社會嘅蓄奴制。喺西晉末「五胡亂華」，唔少嘅人走北方嘅兵亂，去到咗廣東度落腳。其中嘅一啲豪族，征服咗啲弱勢嘅族羣同少數民族，將佢哋當成奴隸，仲規定咗佢哋後世嘅子孫，世代都係主人家族嘅奴隸。蒙古人同滿洲人都有相類似嘅制度，蒙古人就稱啲門戶奴隸那可兒，滿洲人就稱做包衣阿哈。
The hereditary servant system is a slavery system that originated from feudal society. At the end of the Western Jin Dynasty, many people went to the north to settle down in Guangdong. Some of these wealthy clans conquered some disadvantaged ethnic groups and minorities, treated them as slaves, and also stipulated that their descendants would be slaves of the master family for generations. Both the Mongolians and the Manchurians had a similar system of photographs, the Mongolians called some gateway slaves Nak'er, and the Manchurians called Baoyi Aha.