关闭一个多头仓位取决您的经纪商是否受美国交易法规的监管。
在2008年金融危机之后,美国国会通过的多德-弗兰克法案导致了严重的外汇交易法规的变化。其中一个就是无对冲规则条例。在引入这个规则之前，外汇交易员可以可以通过相同货币对的空头对已存在的多头进行对冲。
例如，交易员在1.35的价格对欧元/美元进行了多头操作。交易员之后发现该货币对有在1.38封顶的迹象。因为价格仍然可能上涨，交易员不想放弃持有的多头仓位，但是他想使自己免于一个临时下降调整或者市场真正反转的损失。因此，他在1.38对欧元/美元货币对进行了空头。这个交易员此时就同时持有多头和空头仓位。一个方向的损失将会被相反方向的操作抵消。理想情况下，进一步的市场活动将会揭示长期市场趋势并能关闭其中一个仓位并获利，留下另一个仓位，希望在未来长期趋势中获得更大的利润。
监管制度的改革禁止了对冲操作。现在在美国监管制度下，如果一个交易员存在多头订单，他想要进行空头操作，那么他的空单操作只能关闭他的多头订单。在美国监管规定下的交易员，对持有的多头仓位的平仓方法是卖出该货币对。
然而，那些运用经纪商公司不受美国监管制度限制的交易员必须通过选取多仓位置并发布指令来进行平仓。如果发起一个空头订单，那么就建立了一个如上面描述的多头和空头的对冲。
How do I close a long position in forex?
Closing a long position in forex trading depends on whether you are using a broker operating under U.S. trading regulations.
In the aftermath of the 2008 financial crisis, the Dodd-Frank act passed by the U.S. Congress resulted in severe changes in forex trading regulations. One of those changes was a no-hedging rule. Prior to the introduction of the no-hedging rule, forex traders could hedge existing long positions by initiating short positions in the same currency pair.
For example, assume a trader establishes a long position in EUR/USD at 1.35. The trader then sees signs of the market possibly topping out at the 1.38 level. The trader doesn't wish to abandon his existing long position, since the price may still go higher, but he wants to protect himself against a temporary downside correction or actual market reversal. To do so, he initiates a short position in EUR/USD at 1.38. The trader now holds both long and short positions in the market. Losses in one position will be offset by profits in the opposite position. Ideally, further market action will reveal the long-term market direction and one of the positions can be closed out, potentially at a profit, leaving the remaining position in place, hopefully to amass greater profits from the market's long-term trend.
Regulatory changes eliminated the use of hedging. Now, under U.S. regulations, if a trader places a sell order in a market where he has a long position, the sell order will only close out the existing long position. For traders operating under U.S. regulations, the way to close a long position is to enter a sell order for the currency pair he is long.
However, traders using a brokerage firm that is not under the operational control of the U.S. regulatory authorities must close existing long positions by selecting the long positions on their trading platform and sending an order to close the position. If they instead initiate sell orders, a hedge of both long and short positions will be created, as described above.
本文翻译由兄弟财经提供
文章来源：http://www.investopedia.com/ask/answers/042215/how-do-i-close-long-position-forex.asp