How much the credit card of China Merchants Bank can overdraw is determined by the credit limit of the credit card. Generally speaking, when a user applies for a CMB credit card, the bank will make a comprehensive evaluation based on the submitted application materials, thus giving the corresponding quota. If the credit card limit approved by the applicant is 6,543,800 yuan, then the cardholder can use the credit card of China Merchants Bank to overdraw 6,543,800 yuan.