According to the headline news Global Network, the epidemic situation in Guiyang started on August 3rd 1, and COVID-19's abnormal case1case was found in routine monitoring of risk occupational population in Huaxi District of Guiyang. At 3 o'clock on September 1 day, Guiyang CDC re-examined the nucleic acid test results and immediately transported it to Jiangjunshan Hospital in Guizhou Province in a closed loop. At 6: 25 on September 1 day, it was diagnosed as asymptomatic infection by the provincial expert group.