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The Korean traditional wooden architecture's elevation can be classified into stylobate part(基壇部), wall part(軸部), and roof part(屋蓋部). Of these, roof seems to be very important part due to the fact that hierarchy and decoration varies with shape and scale. The frame structure composition is largely composed girder, the Dori(道里) and rafter on the upper column, and which is made up these roof is primarily determined shape of roof. So the scale of roof and the frame composition are very important element to be considered with the plan scale. The roof scale can be defined as the arrangement of the dori and the horizontal arrangement is controlled within the range of the side length. But the vertical arrangement has a direct relationship with the roof size. Eventually this section has to be considered from initial planning because the slope of rafter, the eaves extrusion and the concave curve of the whole roof are affected on the location of the purlin. Also this study try to find the arrangement of the dori by the existing divided method of distance Dori and a structural function related the eaves extrusion. So it will be provided guideline about the location of Dori and the set-up slope of a roof. And this study can be useful as basic datas for the role of design and restoration/repair of wooden structure.