China citizens can only have a unique legal account and a unique ID number. In the past, the ID card number was generally confirmed by the public security organ when it was 16 years old (now it is confirmed as soon as it is registered). Once confirmed, it will remain unchanged for life, no matter where the account is moved, the number will follow.

If there is any change, you can open an ID number at the dispatch office to change your name (the department that specializes in managing ID cards), bring a new ID card, and then you can check the ID card at the bank that bought the fund. If you don't change it, it will be very troublesome in the future, because the original number has been invalidated.