变动保证金 - [变动保证金] 变动保证金是指清算所规定的，在会员保证金帐户金额短少时，为使保证金金额维持在初始保证金水平，而要求会员增加交纳的保证金。 清算所为了防止出现负债情况，采取逐日盯市（Marking to Market）的原则，用每日的清算价格对会员的净交易部位核算盈亏。当发生亏损，保证金帐户金额下降时，清算所便要求会员必须交纳变动保证金。在保证金交易过程中，根据评价亏损，如果其保有单子的评价亏损达到规定的金额的时候，也就是说当超过交易保证金的40%的评价亏损发生时，或者帐户最低预交保证金余额跌破60%底线时，将被要求追加不足金额。 variable margin A variable margin payment that is made by clearing members to their respective clearing houses based upon adverse price movements of the futures contracts that these members hold. Variation margin is paid by clearing members on a daily or intraday basis in order to reduce the exposure created by carrying highly risky positions. By demanding variation margin from its members, clearing organizations are able to maintain a suitable level of risk and cushions against significant devaluations.