Custody class refers to the institutions that citizens, legal persons or other organizations outside schools use fixed legal and safe business premises and are entrusted by guardians of primary and secondary school students to provide for-profit service activities such as dining, rest and supervision for primary and secondary school students in the administrative area of this Municipality during non-teaching hours.

After-school educational institutions refer to institutions that carry out various educational activities for children outside school life. Comprehensive, such as Children's Palace, Children's Home, Children's Activity Center, Children's Park, Children's Outdoor Activity Camp, etc. ; Specialized, such as children's library and children's reading room, children's theater and children's cinema, juvenile science and technology station, juvenile amateur sports school, juvenile railway, etc.

The biggest difference between trusteeship and training is that the main educational purpose of training is only one-parents hope to improve their children's performance through training. But trusteeship has been integrated into the content of "helping children do a good job in life".