目前的初中数学教材中多处出现“规定”的字眼,但教材中或教师的实际教学中一般却对“规定”的合理性视而不见,或敷衍了事.以非正整数指数“规定”的合理性为例进行探析,旨在说明对数学上的一些规定的必要性和合理性的解释,对于学生数学素养的提升具有重要的价值. The current junior middle school mathematics textbooks appear in many places with the word “regulations,” but in teaching materials or teachers’ actual teaching, they generally ignore the rationality of the “provisions” or perfunctory things. They use non-positive integer indices. The rationality of the “provision” is used as an example to analyze and explain the necessity and rationality of the interpretation of some mathematics provisions. It is of great value for the improvement of students’ mathematics literacy.