The secondary card is relative to the primary card. Every cardholder who opens a master credit card can apply for a supplementary card for other natural persons with full capacity for civil conduct or natural persons with limited capacity for civil conduct who are over 13 years of age (if the applicant for the supplementary card is under 18 years of age, he must obtain the consent of his legal representative). Each credit card master card can apply for up to two supplementary cards, and the master card holder has the right to request cancellation of its supplementary cards. The credit limit of the secondary card shall be designated by the cardholder of the primary card independently, and shall not exceed the credit limit of the corresponding primary card; If the cardholder of the main card is not specified, the credit limit of the auxiliary card is the same as that of the main card.

All transaction funds, corresponding interest and expenses of the secondary card are included in the account of the primary card, and the cardholder of the primary card bears all repayment responsibilities. However, the primary cardholder and the secondary cardholder shall be jointly and severally liable for each other's debts.