Capital lending is a credit activity in which banks or other financial institutions exchange position funds with each other in the course of operation. This is a temporary swap lending business, that is, borrowing funds from banks or other financial institutions with multiple positions. The loan period is generally short, and some only need one or two days. In western countries, exchange brokers usually borrow money from banks in this way. This kind of lending activity often needs stocks, bonds, etc. as guarantees. , and must be repaid on the second day after receiving the notice from the lender. If the borrower fails to return it on time, the lender has the right to dispose of the collateral. China's capital lending has not been carried out for a long time, mainly interbank lending between financial institutions.

Interbank lending refers to the mutual adjustment between banks to solve the shortage of short-term funds. It is a short-term financing between a financial institution with legal personality and a branch of an unincorporated financial institution authorized by a legal person for the purpose of adjusting positions and temporary surplus and deficiency of funds. It happens when the bank checks out after one working day and finds out how much money there is, in order to make the next day's work go on as usual or use the extra money.

The main transaction object of interbank lending (borrowing) is excess reserve, and the borrowing bank issues a promissory note to the lending bank; The lending bank will issue a central bank deposit check for the lending bank, which is the excess reserve. For the money lender, it is lending, and for the borrower, it is lending. Interbank lending transactions are large and sensitive to market reaction, which can be used as an intermediate indicator of a country's bank interest rate.