It is not a concept at all. The risk reserve is managed by the exchange. In order to cope with the emergency funds when the trading system of the futures market is invaded and force majeure disasters occur, the risk reserve is paid to investors to make up for the losses of investors. The risk reserve is a certain proportion of the futures commission extracted by the exchange. The funds in the customer's margin account are divided into two parts. One part is the margin occupied in the transaction, called the transaction margin, which is occupied by the customer's position, and the other part is the settlement reserve, which is the available part of the funds. When the settlement reserve is negative, the customer service staff of the futures company will call you and ask for additional margin. (Securities and futures related personnel, willing to make friends from all walks of life)