Recently, the campus epidemic in many parts of the United States has become more and more intense. A large number of teachers and students tested positive for new crowns and were forced to suspend classes after school began. Why did the school epidemic prevention in the United States fail repeatedly? The fundamental reason is that when the epidemic prevention measures are not in place, the main reason is to forcibly resume offline teaching in order to show the achievements of anti epidemic. When the anti epidemic balance is again biased towards political interests, how to protect the campus security shrouded by the epidemic?