When activating a Hua Xia Bank credit card, you must sign your name on the form before you can use it. Signing on the back of the card is to ensure the safety of the cardholder. After opening the credit card, you need to sign on the back of the card consistent with your name when applying for the credit card. Your identity needs to be verified when swiping the card to make purchases, but the signature is important to the cardholder. Even better, according to regulations, the signature strip on the back of the credit card must be signed before it can be used normally.