Since the introduction of so-called "Four Books", the learning sequence of Mencius in "Four Books" has changed several times.ZHU Xi ranked Mencius as the "third" place in the "Four Books", and then under the imperial examination system, Mencius was ranked the "fourth" place.Later on, the learning sequence of Mencius changed with the modern educational transformation.Each change was affected not only by the educational system and policies, but also by people's understanding of the difficulty in studying the Great Learning, the Doctrine of the Mean, the Analects of Confucius and Mencius, as well as the considerations of learning needs of these "Four Books".In this process, the characteristics of Mencius became a kind of concern, and the learning sequence of Mencius has become a key factor influencing the learning sequence of the whole "Four Books".