Apartment interior works by residents have become familiarized 1990s in Beijing. Referring issues of law and ordinance of architecture and investigating 50 interior works, conclusions are as follows. The periods of transformation of developers' completion standards can be classified into four: period of "strict regulation", "relaxed one", "free one", "full completion by developers are advocated". Furthermore, with the transformation of Resident's Apartment Interior Works Management Regulation, places of constructed not by developers in a residential unit became less. I.e. removal or replacement of parts and material were reduced, addition of them increases. And those regulations were not observed strictly.