Many experts believe that human level artificial intelligence will be realized in 25~50 years. What is the significance of the arrival of human level AI? In fact, once many machines pass the Turing test and reach the level of human intelligence, great changes will certainly take place in human society. When we become human beings, what happened during the neocortical enhancement? The quantitative change promoted a profound qualitative change in human history, and this time, the great change will be staged again. Therefore, if machine intelligence is used well, it can accelerate the development of human society. If we do not make good use of it, it may cause a devastating disaster to human beings. The computer that has passed the mirror Turing test surpasses human intelligence. In fact, it is a "square degree" upgrade to the above logic. Therefore, it cannot only control and avoid the disaster, but also "square" the disaster. Therefore, it is necessary to recognize it in advance.