The presence of two bars in the Neocoronavirus antigen self-test indicates that the result of this test is positive, but nucleic acid testing is needed to confirm it. Two bars in the new coronavirus antigen self-test means it is a positive result, but it may also be a false-positive manifestation, because the result of antigen test is subtle to the protein molecule rather than gene test, the reagent’s sensitivity and specificity to the antigen is not as good as that of the nucleic acid test, so the antigen test is less accurate than the result of nucleic acid test. Antigen testing is faster and easier to perform, but compared to nucleic acid testing, it will be less accurate and cannot be used to diagnose new coronavirus infections. At present, a positive antigen test should be promptly reported to the relevant departments such as the community in which it is located, prohibited from going out, and escorted to the isolation point for nucleic acid testing by the person in charge. Negative antigen test can not completely exclude the new crown infection, because there is the possibility of false-negative, should be further nucleic acid test, nucleic acid test is the gold standard for the diagnosis of the new crown virus.