You can overdraft as much as the credit limit of your Guangfa Bank credit card. If the credit limit of your Guangfa Bank credit card is 30,000 yuan, then your overdraft limit is 30,000 yuan. However, it is not recommended that you overdraft for a long time. The entire limit will have a side effect on increasing your credit card limit. If you feel that the fixed quota is not enough, you can apply for a temporary quota. Although the temporary quota is time-limited, it can help you solve the problem of insufficient temporary quota.