The threat to the cyber world of the United States comes not only from its behavior of taking advantage of science and technology to eavesdrop on other countries with impunity, but also from a series of measures such as virus research and development, tissue culture of cyber combat troops and so on. In 2012, the United States used a computer virus called "Flame" to invade a large number of computers in Middle Eastern countries such as Iran, Lebanon and Syria, causing their national computers to be infected, thus stealing data from some high-level officials' computers.