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This study focused on the structure and design of urban housing in Jeju City from 1920's to 1960's. 5 ryang structure has mugoju(無高柱) 5 rang and ganisig(簡易式) 5 rang, that mostly found outside building of main house and a building belong to main house than main house. 2 goju(高柱) 7 rang is traditional housing structure figure, that comes long time continues a way of build housing, further more ganisig or changed to 2 goju 7 rang. Ganisig 7 rang is composed housing style from mugoju, and that housing style appear from during transformation of ganisig 2 goju 7 rang, and generally used to common people.A cross sectional area of the structural lumber has minutely been decreased continuously. In case of girder and cross-beam are shorter than wide because of more difficult to get long material by time to time. Rafter is generally used round shape and butt end is used as cone or six sided shape or eight sided shape. Interior wall of urban housing is used lath from up to bottom, and exterior wall becomes much better way to pile up stones by development of skill to cutting stones.