First, express support and understanding for children, second, affirm children's adaptability and decision, and finally express expectations and gratitude for the school. When writing parents' opinions on applying for a major change, you should first express your support and understanding for your children, and let them know that you agree with their decision and respect their career planning and personal interests. The second is to affirm children's abilities and decisions, and believe that children can adapt to new majors and succeed in them. This can give children more confidence and courage to pursue their dreams. Finally, I express my expectations and wishes to the children, hoping that they will achieve better results and development in their new majors and realize their dreams. At the same time, we can also thank the school leaders for their concern and support for their children's application to change majors.