The root cause of Tieling epidemic is imported from other places. According to relevant news, on August 25, 2022, Tieling City, Liaoning Province held a press conference on epidemic prevention and control, and informed the relevant situation. On August 22nd, Tieling City received information from other cities, and three foreign positive infected people had stayed in Tieling City. According to experts' judgment, the epidemic virus in Tieling is imported from overseas, which is highly contagious and has a strong spread.