This paper tries to undo the thread of thought in the great Learning by the method of basic structure analysis'. The aim is to point out that the great Learning systematically expresses the content of the Confucian thought of rule of virtue and of the steps of practice. Basically it begins by the cultivation of the inner moral wisdom, i.e. 'manifesting the clear character', and ends in the outer accomplishment, i.e. 'biding in the highest good'. Manifesting the clear character means self-cultivation, the practical method and steps are: the investigation of things→making will sincere→rectifying the mind→cultivating oneself; abiding in the highest good means to express one's clear character to the world, the practical method and steps are: manifesting the clear character→regulating the family→bringing order to the state→peace throughout of the world. Everyone should be and is able to cultivate their inner moral wisdom, manifesting their clear character, and their outer accomplishment, abiding in the highest good, depends upon their social positions-one's higher or lower rank of social position affects the great or small outer accomplishment one can achieve. Outer accomplishment cannot be achieved without the inner cultivation, but merely having the inner cultivation without a higher rank of social position, there could be no outer accomplishment.