This study tried to analyze the composition relation of a form in Korean traditional architecture through the viewpoint of visual perception and through the analysis by the number and quantity, and to analyze and implied relationship between the form composition of the traditional architecture and the principles of perception in the contemporary viewpoint by reviewing all the aspects on how to be perceived. Architecture has been studied in the relationship of the form and the space both existing together, so has Korean traditional architecture. But in the present condition with the construction norm of the traditional architecture-well known for its beauty in shape-and documents not existing, so that the study on Korean traditional architecture in the aspects of the form has to be undertaken on the basis of researching the existing architecture theoretically and architecture-relating documents actually. Therefore this study tries to review the mathematical principle and the ideological background of those days, and the attitude of ancestors treatment to the architecture by researching the existing architectural figure. Using mathematical analysis method with the basis of the above synthetically, this study aims at the analysis in the aspects of the visual perception on the form of Korea an traditional architecture.