Probabilistically, when the profit-loss ratio is greater than 3: 1, the long-term profit may be relatively large. Most investment books are also recommended to be sold above 3: 1. More than 30% of futures positions are heavy positions.

1: 1 profit and loss, then you must ensure that your correct judgment rate is above 50% in order to make a profit. If the ratio is 3 1, the requirement for correct judgment rate will drop below 50.