In research of a book, the knowledge structure of Horizontalbar was analyzed so that it might set to carry out the lesson of Horizontalbar in the unit of gymnastics and might teach in the language in which teachers are a little easier and were unified. The following conclusions were obtained as a result of analyzing through the involved reference using the frame of the knowledge structural analysis which the Vicker developed, in order to analyze the knowledge structure of such Horizontalbar. 1. The knowledge structural analysis of the psychomotor domain to Horizontalbar was systematized by selecting not the level of game gymnastics but the functional level of the educational gymnastics which can be guided in the school spot, and analyzing a functional system. 2. The foundation of the knowledge structural analysis of the cognitive domain to Horizontalbar was carried out to the academic theory of a movement study theory, teaching methods, the movement art of divination, and a gymnastics company, and it structurized the knowledge system required to carry out technology of Horizontalbar in a little easier. 3. The knowledge structural analysis of the affective domain to Horizontalbar extracted and structurized the emotion and social contents concerning technology of Horizontalbar by using social psychology background knowledge as a foundation. 4. It became a systematic systematization by this researcher attaching a number arbitrarily and analyzing for analysis of the knowledge structure of Horizontalbar for an improvement of the of-instruction-study method. 5. Analysis of the knowledge structure of Horizontalbar developed in this way conclusively is what the contents which must be carried out by having to be from the time from which students learn iron bar movement are. It will be helpful for grasping beforehand. Again. I think that it is helpful for providing the teachers who guide gymnastics with the clue which it can set to guide a gymnastics subject and can make the deviation phenomenon of theory and practical skill minimize by showing clearly the knowledge system over the function of Horizontalbar, knowledge, and an attitude.