1. Credit cards are mainly used for overdraft consumption. Therefore, after the applicant's application is successful, Industrial Bank will give the cardholder a certain overdraft limit, so that the cardholder can use the card to overdraw or withdraw the pass.

2. If you already have an industrial credit card, you can also apply for a supplementary card for a designated natural person. The secondary card can share the total credit with the primary card, or the cardholder of the primary card can set a certain proportion of the primary card to the secondary card.

3. According to the general law of credit card quota approval, the credit card quota has a great relationship with the card grade. Generally, the overdraft limit of ordinary cards and gold cards is below 50 thousand yuan, and platinum cards are above 50 thousand yuan. The specific overdraft limit is subject to the actual approval.