Traditional classics need to be read carefully, and the true meaning should be understood on this basis. There are some misunderstandings in the annotations of the Mencius. For example, the original meaning of "Rang" is "taking things falling into your lap", and the meaning has evolved into "theft" after the interpretation that "identification of theft does not consider how much is thieved". "Large mansion" means originally the big house where the king lives and is used to refer to the king, but it is often interpreted as ministers. How Shun got rid of the difficulties when "repairing the granary" and "dredging the well" was not mentioned in the work. Interpreters have made reasonable interpretations based on other materials but may not be in line with the original intention. "Destroying houses to build ponds" means to maintain the living mode of fishing and hunting from the perspective of the development history of human society. Root causes of these errors include the black-and-white thinking mode, contradictions, and transformation of ancient "unsophisticated" expression.