For foreign exchange investors, the reason why they are eager for successful trading is not only to make money, but more importantly, it depends on the percentage of transactions that they make money and those that lose money, and the ratio of the amount of money that investors make when they make the right decision to the amount of money that they lose when they make the wrong decision. The success of the transaction is ultimately determined by these factors. Self-discipline is the basic factor that determines how much you can make or lose. According to the trend of exchange rate operation, finding a promising currency is to seize the opportunity, which is more attractive than taking losses or closing positions, because the latter requires strict self-discipline. In fact, this is also the root cause of the failure of many short-term traders. The experience of thousands of traders shows that the timing and psychological state of traders are very important, but "self-discipline" is more critical. Self-discipline helps traders know the profit or stop loss in time. If a trader does not have a high degree of self-discipline, then his "timing" is useless. Indeed, many traders with old and new experience in the foreign exchange market spend far more time choosing currencies than they worry about the possible loss of currencies. Naturally, trading in anticipation of profit is more exciting than quitting trading in order to reduce losses. Short-term experts know how to choose a good currency to buy, but short-term experts know how to withdraw from the transaction in time, instead of waiting until the situation is bad before they have to close their positions. Short-term experts can always make a profit in time when the exchange rate is pushed up. Self-discipline is the most important factor to ensure the survival of foreign exchange investors in the market. Short-term experts must be very self-disciplined and will never turn profitable positions into losses. When the price in the market exceeds the target of investors and continues to rise, greed will desperately shout "wait a little longer and make more money". At this time, self-discipline will not hesitate to fight against greed, let short-term experts carefully close their positions, and force them to pay attention to controlling risks.