1. "Theoretically, the margin ratio should be greater than the upper limit of the futures price". This sentence is correct in theory, but the implementation of the margin system is to increase the risk leverage, and it is impossible for ordinary speculators to control the risk. Price limit is a combination of position limit, position report and other measures to control risks, indicating that only price limit can not effectively control your excessive profits and losses in a day. Debt-free settlement only controls the risk of opening positions one day and the next, but it can't limit your risk all day.

2. The risk rate 150% is not a fixed amount. In general, the maximum is not more than 80%, and the minimum is not less than 120%. The futures company will give you a hint. The margin ratio coefficient is the compensation and repayment ratio of margin maintenance loss. Calculated by market capital flow momentum, trading volume and contract activity.