They only use a maximum limit, such as 5,000 for card A and 10,000 for card B. If card A uses 5,000, card B will only have 5,000 available for use. In other words, the maximum sum of two cards can be 10,000, not 20,000.

If you want to check the available credit limit of two cards, you can use the following methods

First, self-service telephone voice system

Second , Online banking - credit card - card manager - credit card limit

Third, you can use the mobile phone number you reserved in CCB, edit the text message: "313# last four digits of the card number" and send it to 95533 , will reply you with the credit card limit status by the time the text message is sent

Fourth, mobile banking, select "Credit Card Limit Management" in "Credit Card"

Fifth. WeChat, China Construction Bank, select "Limit Management" in the "Credit Card" tab