Concubine-system is the product of the development of male right society, and is the anomaly combination of the feudal private ownership system and hierarchy.
妾媵制度是男权社会发展到一定阶段的产物,是封建私有制和等级制度相结合下的畸形现象。
Though this the ory isn't practical, but it discussed about the negative function of private ownership system and put forward some progressive ideas and valuable spirit of practice.