本文提出了一个计算风险率的新公式 ,并导出了它与价位、头寸、保证金率、涨跌停板率等之间的函数关系 :据此界定了风险率的范围 ,提出了在何情况下要求客户追加保证金 ,追加多少 :在保证金不到位的情况下 ,要不要对客户斩仓 ,斩多少等 This paper presents a new formula for calculating the risk ratio and derives its functional relationship with the price level, the position, the margin rate, the strike-and-climb rate, etc. This defines the scope of the risk ratio and sets out the circumstances under which the client Additional margin, how much appendage: In the case of margin is not in place, or not to customer cut positions, cut, etc.