The purpose of this study is to examine the Bon(本) of the current form of Kumdo, from its establishment to revisions and amendments, and to identify the practical significance and the technical stucture of the Bon for its adaptation to the training process of modem Kumdo. The Bon of Kumdo is largely divided into the Bon of Daedo(大刀; long sword) and the Bon of Sodo(小刀; short sword), the former comprising seven kinds, the later three kinds. The current type of Bon that is used in different competitions and tests is the Japanese style, which was completes in 1933. This Bon synthesized the complex and various Kumdo techniques in a condensed form, which are, from the perspective of modern Kumdo, entirely the techniques of the first move of rare, the most simplified attacking techniques: or, from the perpective of attacker, of which the main body are made up of rare movements. Among these, only the seven Bons of the Daedo are equal first moves, and only the three Bons of the Sodo are in the form of the non-deadly sword, not the killing kind. Such Bon of Kumdo are selective kinetic expressions of the purpose, the method, the soguence, formalized through the experiences of numerous practicxians and accumulation of researches. The Bon of Kumdo must reflect and synthesize the most basic and desired techniques of all and serve as the purification of all Kumdo practices, including manners, facing posture, attack and defnse, distance, cheering, and concluding attitudo. As specified above, the Bon must serve as a means of rejecting self=aggrandizement and superfluous exaggeration, which result form negligence of the martial chsciphne. The Kutn(劍) as the menans of martial art can always turn to a performative object. Accordingly, it is necessary to examine the relation between the Bon of Kumdo and the Bon of modern Kumdo formalized as a competitive game. The Bon of Kumdo is the condensed form of all Jinkum(眞劍; real-sword) technigues of the past, rather dm a form necessitated for Jukdo(竹刀; Bamboo-sword). In other words, the characteristics of the Jinkum and the Jukdo are fundamentally different from each other. It is thus necessary to develop a new form that suits the Jukdo usage on top of the current Bon.