From the perspective of capital (position) management, the logic of adding positions when in profit is actually to balance the contradiction between "risk" and "reward".

Opening a position heavily means that if the directional judgment is incorrect, the loss during stop-loss will be very large, which is a major taboo in futures trading; however, if the position opened is too light, even if the direction is correct and the market moves as expected, there won't be much profit, and the reward will be significantly reduced.

Adding positions in profit is an effective way to resolve this contradiction:

Initially open a light position, and if the judgment is wrong, the loss after stop-loss is limited, which can control risk well.

If the direction is correct and the market develops in the direction of the opened position, use trailing stop-loss to protect profits. When the stop-loss level exceeds the cost price, this position actually has no risk of loss. At this point, if another opening signal occurs, then add positions, and the added portion is also handled according to the new position rules—if wrong, then stop-loss; if right, continue to move the stop-loss, and repeat this process.

The benefit of this operation is that no matter how many times positions are added in profit, only the last addition may face risk, while the previous positions are in a risk-free state, at most not making money but not losing money. Even if the total position gradually becomes heavier, there is no need to worry excessively.

In trading, to achieve a stepwise increase in the capital curve, it often requires using heavier positions to seize opportunities in trending markets, but this is definitely not about opening positions heavily right away (that is gambling), but rather being gradually established through adding positions in profit.

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