Preferentially, this thesis form a Won-Buddhism point of view about spirituality and has a aim to enlarge the boundaries of spiritual education by investigate the principles, methods and characteristic of spiritual development based on tree fold study how to practice of Won-Buddhism. It can be consider that the spirituality of Won-Buddhism means ‘the spiritualized nature’. The expression named ‘spiritual house’ which the first temporary religion name of Won-Buddhism means the house as leading a great opening of spirit of the human race. Because it is first widely open the human mind which was blocked and benighted for establish the one human race and one world. The three fold study means Cultivating the Spirit, Inquiry into Human Affairs and Universal Principles and Choice in Action as the way of practice with attain the awesome power of Il-Won and be unified the substance and nature of Il-Won through awake the Truth of Il-Won-Sang. It can be summarize and arrange as follows that the way of Won-Buddhism practice is considered result from the view of spiritual development. First of all, Won-Buddhism spirituality is communicate with Il-Won-Sang, the Dharm kaya Buddha, which was widely inherent to the original source of all things in the universe, the mind-seal of all the buddhas and sages and the original nature of all sentient beings. Second, through the spiritual development, it can be realize a great opening of spirit and lead all sentient beings to a vast and immeasurable paradise. Third, the way of spiritual development was run parallel with faith in a religion based on truth and training in morality based on facts. Fourth, as a way of spiritual development, it was represented systematic methods of practice on the basis of three fold study of Won-Buddhism. Fifth, the essential Dharmas of daily practice are way of spiritual development having relation with all realm of daily life and it represents the specific Dharmas of training divide into fixed-term and daily. In addition, it was represents in detail from easy way to practical use through the essential discourse on commanding the nature.