EA refers to ExpertAdvisor, also known as intelligent trading system, program trading system and automated trading program. EA is essentially a computer program. It is written into a computer program by programmers according to traders' trading strategies and thinking. As long as the sequence is run in the trading account, EA can automatically analyze the trend of the foreign exchange market, buy low and sell high, and complete the whole trading process automatically without staring at the computer.

EA originated from USA 1975. With the development of computer technology and network technology, foreign exchange traders in many big companies on Wall Street no longer focus on manual marking and manual operation, but constantly write and improve their trading strategies, and then write EA for automatic execution by computers. At present, the most common and mature EA strategy is to judge the trend and trade according to various index strategies.