"Inner Sage" and "Outer King" are the two poles of Confucian life ideal. Inner Saint Kung Fu is the outward expansion of inner saint, self-cultivation and perseverance. The core and theoretical basis of Confucianism's study of foreign kings is its theory of benevolent governance, which is rooted in the fertile soil of national cultural psychology and meets the political needs of rulers in governing the country and safeguarding the country. Compared with Taoism, it gained a unique position in China feudal society. In Confucianism, the inner sage and the outer king show the bipolar unity based on reality. Mao Zedong was influenced by "the sage inside and the king outside" since he was a child, which deeply influenced young Mao Zedong's philosophy of life and ideal personality. Influenced by the Confucian thought of "sage inside and king outside", young Mao Zedong paid attention to "great source" and devoted himself to the cultivation of moral conduct. After the May 4th Movement, with the change of Mao Zedong's world outlook and values, the connotation and realization of "being sage inside and king outside" have also undergone fundamental changes. The pursuit of "sage inside and king outside" runs through Mao Zedong Thought and practice. Although the ideological connotation expressed by "inner sage and outer king" may be very different in different stages of life, the thinking mode and values behind it are strikingly similar. The cultural information revealed is that Mao Zedong's cultural mentality and practice are consistent with Confucianism.