As long as it is approved by the bank, an ID card can apply for a credit card, and a bank has only one credit limit. For example, if you set up two credit cards at the Agricultural Bank of China, the credit limit of card 1 is 5000 yuan, and the credit limit of card 2 is 10000 yuan. Then your credit line is 10000 yuan, not 15000 yuan.

Of course, if you have a business license, you also need to prove your income ability.