Heavy foreign exchange trading refers to the heavy trading when the required margin is greatly increased due to too many positions, and the position margin accounts for more than 20% of the total funds. If the position is controlled within 20%, it becomes a light warehouse transaction. The biggest difference between heavy foreign exchange positions and light foreign exchange positions is whether the proportion of positions in the total account funds exceeds 20%. If it is a heavy trading, investors should lighten their positions as soon as possible.