1. Maintaining educational equity: Retired teachers' part-time jobs will have a negative impact on educational equity. Part-time teachers will give priority to their own students or favor their own students in teaching methods and contents, which will cause unfair treatment to students.

2. Standardizing teachers' behavior: Retired teachers' part-time job will lead to conflicts of interest and improper behavior. Retired teachers use their positions to gain improper benefits, which not only affects teachers' image, but also damages the fairness and authority of education.