AdditionalMargin refers to the provisions of the clearing house, in the member guarantee? When the amount of gold account is insufficient, in order to maintain the deposit amount at the initial level, members are required to increase the deposit paid. Margin increase means that when the amount of the margin account of a member is insufficient, the settlement institution requests to increase the margin paid by the member in order to maintain the margin amount at the initial margin level. In order to prevent liabilities, the clearing house adopts the principle of marking the market day by day and uses the daily clearing price to calculate the profit and loss of members' net trading positions. When losses occur and the amount of the margin account drops, the clearing house requires members to pay extra margin.

Forced liquidation means that when the trading margin of members or customers of a futures exchange is insufficient and not replenished within the specified time, or when the positions of members or customers exceed the specified limit, or when members or customers violate the rules, the exchange implements forced liquidation to prevent the risk from further expanding. There are many reasons for compulsory liquidation in futures trading, such as customers' failure to add trading margin in time, violation of trading position restrictions and other irregularities, temporary changes in policies or trading rules, etc. In the standardized futures market, it is most common that customers are forced to close their positions because of insufficient trading margin. Specifically, it refers to the behavior that a futures company forcibly closes some or all of its customers' positions in order to avoid losses. When the trading margin required by the customer's position contract is insufficient, the futures company fails to add the corresponding margin in time according to the futures company's notice or actively reduce the position, and the market situation is still developing in an unfavorable direction, the obtained funds are used to fill the margin gap.