If you forget the student number of Changzhou Children's Palace, there are several ways to get it back:

1. Contact the customer service department of Changzhou Children's Palace and provide the personal information left at the time of registration, such as the original admission notice. They may use this information to help find the student number.

2. Contact the school's student management personnel, who may have kept the relevant information of the student number, or they can find it through the school official website and other channels.

These are the two most common methods, but the specific methods of retrieving student numbers may vary from region to region and institutions. If the above methods fail to retrieve the student number, it is recommended to contact the customer service department of Changzhou Children's Palace directly for further help.