Work units, called danwei, are one of the principal territorial forms used to organize China's urban population. These enclosed spaces are the socio-spatial units in which the livelihood and domestic and social activities of its members are carried out. The danwei are described by considering: (1) the origins of the concept, (2) phenomenological meanings in contemporary society, (3) socioeconomic-political characteristics, and (4) their spatial implications in the transformation of Chinese society.