Bank-to-bank business refers to a kind of financial service in which our bank, as the opening bank of the investor's bank settlement account and the futures company's customer margin account, establishes a one-to-one correspondence between the investor's bank settlement account and the futures fund account through the system docking of the futures company, and then the investor sends the fund transfer instruction through the channels provided by our bank or the futures company to realize the real-time transfer of funds between the investor's bank settlement account and the futures company's margin account.