1. Different banks have different requirements, usually 6 months. Some banks can apply for a card after 3 months. \x0d\2. The process of applying for a card with a card is relatively simple, but there are certain conditions. If the cardholder wants to apply for another credit card using the credit card he already has, the cardholder generally needs to use the original credit card for more than 6 months before he can apply for another credit card at another bank. For Bank of China, the required card holding time is relatively short. Bank of China credit card holders only need to use the card for more than 3 months to apply for a card. \x0d\Expansion:\x0d\Credit card security issues:\x0d\Credit card: Criminals or criminal groups use fake or invalid cards (expired/lost/damaged/tape damaged...etc.) to pretend to be genuine cards for consumption, directly defrauding merchants or Card issuer. \x0d\Cardholder: Poor storage/handling of cards (expired/invalid credit cards are not destroyed, or lost cards are not immediately invalidated, etc.), and personal identity information is unintentionally stolen or defrauded. To avoid such problems, citizens should not easily provide personal identity information to others, and it is best not to entrust others to handle credit cards on their behalf. \x0d\Consumer merchants: Service staff overcharge cardholders during their consumption process, or steal their credit card information to make purchases at other merchants. This situation can happen whether it is a physical merchant or an online virtual merchant.