Abstract: Sun Yat-sen’s  three-stage strategy to practice military politics,political tutelage,and constitutional politics is a revolutionary plan in carrying out “Three Principles of the People” and the theory of “the separation of five powers”.It is a strongly operant pattern of constitutional construction that combines incrementalism (quantitative change) and radicalism (qualitative change) according to the actual conditions of modern Chinese history.It has enlightenment in today’s democratic and political construction.Great importance should be given to constitutional democracy,and the world trend should be combined with Chinese characteristics.In this way,we may become rational in constructing constitutional democracy.

Key words: Sun Yat-sen, military politics, political tutelage, constitutional politics, pattern of constitutional politics