We have written a lot of EA and accumulated a lot of experience in mechanical system trading. For some time, we have been studying the probability and winning rate of gambling, including the betting strategies of some casino experts, which is very helpful for the management of foreign exchange funds. In addition to the winning rate of placing an order, you should also consider closing the position. If you win after placing an order, whether it can become a real profit depends on your liquidation strategy. If the closing strategy is not good, making money will become a thing of the past. There are several ways to try EA trading: (1) small stop-win (such as 10 point), large stop-loss (such as 1000 point) and ultra-short-term. This can improve the success rate, through a lot of small wins, but we must overcome the occasional big losses. (2) Earn 95% profit from 5% transactions. This is the trend trading method, which places an order at the beginning of the trend and closes the position at the end of the trend. By trend, I mean the trend you think. Of course, its success rate cannot be greater than 50%. The result is that most transactions are small wins and small losses, and small losses account for the majority, but in a few cases, the trend is really biased towards you, then you can make a lot of money, and it is not surprising to earn 1000. You have to be able to tolerate endless small losses and even slap in the face caused by consolidation most of the time, but you must persist, otherwise when you give up, the next trading opportunity may be a real big market. (3) Breakthrough trading method: For example, according to the Turtle Law, breakthrough is a good method. Simply put, it is chasing up and killing down. There is no highest, only higher, and there is no lowest, only lower. But the question is: what kind of breakthrough is an effective breakthrough? If we can't solve this problem, we will die miserably, because most breakthroughs are fake. (4) There are few trading opportunities that most people don't know about. This kind of trading opportunity is rare, and you need to work hard to find it. For example, the timing of bottoming out. Rarely, but the success rate is high. To sum up, what does a good EA look like? (1) can achieve good results in the retest of historical data. Although historical achievements do not represent future achievements, this is all we can do. (2) There are few parameters to be adjusted and the conditions are not complicated, so EA can automatically adapt to all changes. (3) Suitable for as many currency pairs and time periods as possible.