As to this research, with the eaves configuration of the front side and back side comparing and analyzing the mathematical feature of the eaves end part against the other building and classifying a type and clarifying a feature and investigating the mathematical relation a result is as follows. The building showing the different shape eaves can know to be the intentional plan which shows the asymmetry case in not only the eaves but also the Gong-Po style or the Do-ri Structure and is planned from the first stage. The different shape eaves can classify as 3(in case the same type and front side are long, the back side is long) around the rafter extrusion of the feeling back side and because the where the back side is long case can subdivide in a relation with the Buyeon(附椽) extrusion, it can classify the case as the whole five types. The feature of this form is the plan considering the dispersion of the load according to the asymmetric composition and showing the reward which is most in the 다-2 type determined to be preferred in the different shape eaves. This is determined to even when relatively making up the Do-ri Structure or the Gong-Po style equally, control the rafter extrusion of the back side and may maintain the balance of the load. And it is judged that the fixed rate exists as to the eaves end part.