Novel coronavirus incubation period can be detected by doing in vivo novel coronavirus nucleic acid test by throat swab and blood. However, it may not be detected by a single test, and it may take many times to show positive. There are no symptoms during the incubation period, and patients in the incubation period usually do not do this test, unless they have been to an infected area or have been in contact with an infected area and are too worried to be tested repeatedly. The incubation period of novel coronavirus pneumonia is relatively long, and the incubation period is also contagious, so this is a difficult point in the prevention and control of this outbreak.