What does the social security card number mean?

Card serial number refers to the specific number that banks need when using social security cards for payment and other services.

The bank line number of social security card refers to a specific number that banks need when using social security card for payment, settlement and transfer. This number was issued by the People's Bank of China, which is essentially an identification code to distinguish different financial institutions and their branches.

Each financial institution has its own unique "three-digit" code, also known as "payment system participant code", which is called "joint bank number" in China.