When the child is four years old, his emotional control ability is not mature enough, and it is normal to have a bad temper. Here are some ways to help you guide your children:

1. Communicate with children: When children lose their temper, don't try to make them stop immediately. Instead, communicate with them and let them know that you are listening to them. This can help children feel understanding and support.

2. Give children the right to choose: In some cases, giving children the right to choose can help them have more control and self-confidence.

3. Establish rules and restrictions: Establish some rules and restrictions to ensure that children know which behaviors are acceptable and which behaviors are unacceptable. This can help children learn self-control.

4. Give children positive feedback: When children behave well, give them positive feedback and rewards. This can help children learn how to make the right decision.

5. Keep calm: When the child loses his temper, keep calm and keep a safe distance. This can help children learn how to stay calm under pressure.