According to the regulations of bank credit cards, the primary card and the secondary card must be the same person's name. The primary card refers to the cardholder's own credit card, and the secondary card refers to the supplementary card authorized by the primary card holder. There is a relationship between the main card and the auxiliary card, and the consumption behavior of the auxiliary card will affect the credit record and repayment responsibility of the main card holder. Therefore, in order to ensure the security and compliance of credit cards, the primary card and the secondary card must be the same person.