I applied for a credit card of China Construction Bank, and it took me a year to withdraw it. In addition to maintaining a good credit record, I also took the initiative to apply for withdrawal.

Although I don't know much about BOC cards, there are a few that are common to all banks:

1. Always use credit cards, and the more times you swipe your cards, the better.

2. Ensure the amount of credit card spending every month. It is best to spend at least 50% of the total amount every month.

3. Ensure that the credit card can be repaid in full and on time. You know, good credit information is the premise.

4. Enrich the consumption types of credit cards. The more kinds of dining and entertainment, the better.

5. Take the initiative to apply for promotion.

I don't know how long it took you. Generally, it will take at least half a year before the bank will give you a line.