Introduction to the trilogy of foreign exchange trading: Foreign exchange trading is a systematic process. If you can't control foreign exchange trading with systematic thinking, it is almost impossible to achieve sustained high-level performance. The trilogy of foreign exchange trading divides foreign exchange trading into four key steps, namely, driving analysis, psychological analysis, behavior analysis and position management, among which the first three steps are foreign exchange analysis, which is what we usually call the trilogy. The difficulty of foreign exchange trading lies not only in traders' lack of systematic thinking, but also in the fact that the market has the characteristics of random strengthening, and traders have a trend effect, which leads to continuous losses of foreign exchange traders. The "3+ 1" step to be introduced in the trilogy of foreign exchange trading is a powerful weapon to solve these two problems.