The Margin System, also known as the margin system, refers to the system stipulated by the clearing house that the buyer or seller who makes a futures transaction should pay the performance bond. In futures trading, any trader must pay a certain proportion (usually 5% ~ 10%) of the price of the futures contract he buys and sells as the fund guarantee for his performance of the futures contract, and then he can participate in the futures contract trading and decide whether to add funds according to the price. This system is the deposit system, and the funds paid are the deposit. The risk reserve system refers to the system in which a futures exchange draws a certain proportion of funds from the transaction fees charged by its members as a reserve to ensure the exchange's performance. The establishment of exchange risk reserve is to provide financial guarantee for maintaining the normal operation of the futures market and make up for the losses caused by unforeseen risks. The exchange should not only extract the risk reserve from the transaction costs, but also establish the special risk reserve for stock index futures paid by members in view of the special risks of stock index futures. The special risk reserve for stock index futures can only be used to provide financial guarantee for maintaining the normal operation of the stock index futures market and make up for the losses caused by unforeseeable risks of the exchange. Risk reserves must be accounted for separately and stored in special accounts, and shall not be used for other purposes except to make up for risk losses. The use of risk reserve shall follow the prescribed legal procedures, be approved by the board of directors of the Exchange, and be reported to the China Securities Regulatory Commission for the record, and be carried out in accordance with the prescribed purposes and procedures. The risk reserve system has the following provisions: 1. The exchange shall withdraw the management fee according to the proportion of 20% of the fee income (including preferential relief for members) collected from members. When the risk reserve reaches 10 times of the registered capital of the exchange, it may not be withdrawn. Risk reserve must be accounted for separately and stored in a special account, and shall not be used for other purposes except to make up for risk losses. The use of risk reserve must be approved by the board of directors of the exchange, reported to the China Securities Regulatory Commission for the record and carried out in accordance with the prescribed purposes and procedures.