Changing bank cards depends on different situations. If the fund is purchased through the agency channel of the bank, the card can be changed directly at the bank without changing the bank, and the bank staff will give specific instructions; If you purchase funds through direct fund sales channels (opening an account in official website Fund Company for purchase), you need to contact the customer service staff of the Fund Company to change the bank card. Under the guidance of customer service staff, you need to download the relevant documents, fill them out completely and print them out. It may need to be stamped by the bank and then mailed to the fund company. After the fund company handles it, it can directly log in to official website to change the card. If you buy a fund from a third-party organization, you also need to call customer service, and the process is similar to the fund direct sales channel. It may take a little longer.