The purpose of this study was to explore the periodic changes of apartment supply between 1980 and 2001 in the City of Donghae. A survey was conducted with 82 apartment complexes that were built in during 21years. The data were itemized and specified by the unit house area, story, periodic and local apartment distribution. They were classified by five:(5) periods and analyzed by each apartment complexes for building characteristics. There were found that apartment housing were influenced by many primary factors such as demographics and a lot of the housing politics etc. The results of this study were as follows: 1) Apartment supply in the City of Donghae mass-produced from 1980 to 2001; Especially the forth period was supplied 5,999 households. 2) Between south area and north area was found a regional disparity. 3) The exclusive use $34{sim}66m^{2}$ were continuously and centrally supplied according to the housing policy and practical demand. 4) For the types of story were variously found ; Especially the below 5 story apartment was continuously supplied.