If you want to choose a suitable children's ballet training school in Beijing, you can consider the following points:

1. Teaching quality: Choosing a school with good teaching quality can be evaluated by understanding the teaching staff, teaching environment and students' performance.

2. School reputation: Choosing a school with a good reputation and excellent students' performance can be evaluated by asking other parents about the school or visiting the teaching situation of the school.

3. Curriculum: Choosing a variety of courses can not only meet children's learning needs, but also have a variety of performance and competition opportunities.

4. Convenient transportation: Choosing a school with convenient transportation can facilitate you to pick up and drop off your children and reduce the inconvenience for children to attend classes.

5. Tuition: Choose a school with reasonable and affordable tuition.

When choosing a school, it is best to know more about several schools first, and then make a comparative choice according to your actual situation. I hope these suggestions are helpful to you.