When I went back home last night, I visited the Bank of China website and looked around but couldn't find online banking registration. After much difficulty, I finally found it, but it was only for debit card registration; there was none for credit cards. After searching on Google, I discovered that the Bank of China's credit cards basically do not support online banking. The word "basically" is used because it seems to have something called a "mini online bank". In short, the Bank of China's online banking must be opened with a debit card, which is also known as a savings card. Only after associating the credit card with it can it be used, which is very troublesome. I kind of regret applying for another Bank of China credit card, not only because the credit limit is low, but also because two credit cards from the same bank actually need to be repaid separately.