Each remittance will probably generate about 200 Hong Kong dollars in bank and wire transfer communication fees.
2. Turn RMB into cash: You can ask your friends in Hong Kong to find foreign exchange shops (Hong Kong is everywhere) to change Hong Kong dollars into RMB (you can have an exchange certificate with the exchange rate written on it), and then ask them to deposit RMB cash in Shenzhen or any city in Chinese mainland at the bank counter or ATM (ATM that can accept cash deposits) of the local branch of your domestic bank, and deposit it with you according to the account you provided. It′s on the house.
You'd better open an account with China Bank (with the same name) and remit money. Then withdraw money from the domestic China Bank. If I use a domestic ID card, I wonder if there are any remittance restrictions. If Hong Kong people withdraw money in China, remember that there are restrictions.
There is another way I remember, that is, let your friend apply for a bank card at Hongkong and Shanghai Banking Corporation, and then you can keep the card and password well, and then you can withdraw money directly from the domestic HSBC ATM.