Can I use different bank card accounts for the same stock transaction? Which bank account is cheaper for securities trading?

1. No: when opening an account, a third-party bank will deposit and bind your securities account, and you can only transfer money between the bank and the securities through this bank.

2. There is no handling fee for bank-securities transfer, and you can transfer it as you want. But if the amount is huge, such as more than 500 thousand, you need to make an appointment in advance to transfer money.