According to Caiti's data Com, underwater stock buying refers to investors buying stocks when the deviation index is below the zero axis. In the stock exchange market, the water above means that the differential value index is above the zero axis, and the underwater means that the differential value index is below the zero axis.

Underwater covering position refers to the covering position operation of investors when the increase is negative. Through this operation, the cost of their positions can be shared equally and the risks can be dispersed. The water surface refers to a line that does not rise or fall, with water above and water below. Of course, in the process of covering positions, investors need to pay attention to buying in batches reasonably, and never buy them all at once.