If the China Merchants Bank card cannot remember the credit card number, the following is for your reference: 1. Do you remember whether you have bound the credit card through third-party channels? You can try to check through the binding platform; 2. I have registered through the local Try to check at the counter; 3. If your family has helped you repay the money, you can confirm whether there is a record of the transfer out of online banking or whether it can be checked.