If you enter the password incorrectly for 3 times, the credit card will be locked. This paper introduces several handling methods. \xd\ Handling method of Industrial and Commercial Bank of China: If the cardholder makes three wrong entries, it will be locked. After being locked, the cardholder needs to bring the credit card and his valid ID card to the local credit card center for unlocking. \xd\ Handling method of China Bank: When the cardholder has entered the wrong password for three times, the credit card center of China Bank will automatically unlock it after 24 hours. \xd\ Handling method of China Merchants Bank: When the cardholder enters the wrong password for 3 times, the credit card will be locked. When the card is locked, the cardholder calls the customer service hotline of China Merchants Bank Credit Card to transfer the manual service, and the customer service specialist will reset the inquiry password for you after checking the cardholder's information.