1. Listen to children's voices: First of all, it is important to listen to children's feelings and experiences. Give children a safe environment and make them feel comfortable and accepted.

2. Collect evidence: Collect evidence about school bullying. This may include children's dictation, conversations with other witnesses, photos or videos, etc.

3. Cooperate with the school: Contact the teachers, counselors or principals of your children's school, share your findings and seek their help. Schools have the responsibility to safeguard students' safety and well-being, and they should take necessary actions to solve the school bullying problem.

4. Education and training: Encourage schools to carry out school bullying and interpersonal education and training activities. Strengthen awareness education for students, faculty and parents.

5. Seek professional help: If the problem is serious or persistent, you may need to seek professional help. This can include consultants, psychologists, social workers and other relevant professionals.