Abstract: The origin of mediocrity is Shangzhong, and Confucius first made a systematic exposition of mediocrity. "Mediocrity" means moderation, reasonableness, impartiality, and equilibrium between two opposing sides of a contradiction, and emphasizes the practicality of mediocrity. Mao Zedong highly valued Confucius's idea of the middle ground, and on the basis of critical inheritance, he gave it a brand new interpretation, firstly, from the perspective of "two fronts", he made a new interpretation of "the middle ground", and secondly, from the social significance of the middle ground, he characterized the eclectic nature of the middle ground. Mao Zedong's interpretation of the "middle ground" can be summarized in two aspects: first, he paid special attention to discovering the practical significance of the idea of the "middle ground," and second, he believed that the idea of the "middle ground" had a dual nature, both in line with the dialectical side and in line with the social significance of the "middle ground". The second is that the idea of "the middle ground" has a dual nature, both in line with the dialectical side and contrary to the dialectical side. The wisdom and charm of traditional philosophy contained in the idea of the "middle ground", as developed by Mao Zedong, has become even more instructive in guiding the practical development of socialism with Chinese characteristics.