Teachers can help children establish good peer relations by the following methods: 1. Provide cooperation opportunities: arrange cooperation activities and group projects, encourage children to solve problems and complete tasks together, and promote children's ability of cooperation and interdependence. 2. Teaching social skills: Teachers can guide children to learn social skills such as sharing, listening, respecting others and getting along well, and cultivate children's social skills through role-playing and game activities. 3. Create a supportive environment: Teachers should create a safe and friendly environment, encourage children to express their feelings and needs, resolve conflicts in time, and cultivate an atmosphere of friendship and mutual assistance. 4. Observation and intervention: Teachers should closely observe children's interaction, intervene in time when problems are found, provide guidance and support, help children solve contradictions and cultivate their ability to solve problems. 5. Encourage friendly behavior: praise children's friendly behavior, help them realize the importance of friendly behavior in establishing good peer relations, and set an example for them.