1. Handling at China Construction Bank outlets: If it is necessary to handle supplementary credit card (debit card), the applicant for the main card and supplementary card shall go to the outlet of China Construction Bank with his/her valid identity document and obey the instructions of the outlet staff.

2. Online processing: log in to the credit card (debit card) website of China Construction Bank, and then click "Apply for credit card (debit card) online" on the page to apply for a credit card (debit card) sub-card.

However, it should be noted that some credit card (debit card) types do not support online processing of credit card (debit card) daughter cards, so in this case, you need to bring valid certificates to the bank outlets for processing.