The aim of this paper is to clarify the historical origin of the [yiming ・ liangan] type whose frontage has odd bays, is regarded as typical and traditional unit of the planning composition of Siheyuan,and present a new interpretation of the connection with the typical[one hall two bed roomjtype in Han dynasty.At last,we will attempt to clarify the proper place in [yiming ・ liangan] type, and the change prosess of the planning composition in the housing history of China.
