Generally, when a credit card expires, the credit card center will issue a new card directly without changing the card number, or the cardholder's card is damaged and cannot sense the magnetic stripe, so it is difficult to continue using it, and the card number needs to be changed. However, in some cases, it is necessary to change the card number. For example, when the new card that should be sent is not received on time, the card number will change when the cardholder applies for sending a new card again. For example, if the cardholder reissues a new card after reporting the loss, the card number will also change. Now many people's credit cards are bound with automatic repayment, Alipay fast payment and other projects. Changing the card number also requires the cardholder to change related items to avoid inconvenience in the process of using the card.