Fixed spread stop loss-short-term, stop loss does not exceed 20 spreads at most, for plastics and pta, it does not exceed 100 yuan at most.

2.

Take opening multiple orders as an example. Look at the nearest low point on the left and put one or two spreads below the low point as a stop loss. If you can't find a low point, or more than 20 spreads, use the fixed stop loss above. (Empty orders are the opposite)

3. If the spread after opening is around 10, set a stop loss at the breakeven price with lightning; Then, as long as the price reaches a new high (for a long time), raise the stop-loss price-this can prevent the sudden reverse fluctuation of the price from devouring profits.