1. First, call the customer service hotline of Bank of Communications, provide the credit card information and the beneficiary bank card number to be changed, and consult the customer service staff for the specific change process and requirements.

2. Secondly, follow the instructions of the customer service staff and provide identity verification information, credit card account information, cardholder name, and ID number.

3. Finally, submit the application for changing the beneficiary bank card number according to the guidance of customer service.