The second bar of the new coronavirus test paper is not obvious need to consider the possibility of weak positivity. There are two lines to identify the results of the novel coronavirus antibody test kit. The first bar is the C zone for quality control, which is used to determine whether the kit is valid and can work properly. The second bar is the T zone, which is the test zone, representing whether or not the novel coronavirus infection is detected. If the first bar of the quality control area is not present during the test, it means that the kit is not valid and needs to be retested. If the test is that the first bar appears and the second bar does not appear, it means that the novel coronavirus test is negative and no novel coronavirus infection is detected. When the second bar appears in color, even if it is not obvious, it suggests a positive test for novel coronavirus. Patients who test positive should be reported for further management, and if isolation is needed, retesting is required to clarify the diagnosis. In the early stage of novel coronavirus infection, due to low viral load and empty window period, the kit cannot detect novel coronavirus, and the test may be false-negative, which needs to be reviewed for confirmation. It is recommended to report any positive result and seek help and consultation from a specialized healthcare facility, and isolate the patient in a specialized healthcare facility. Remind family members to wear masks and ventilate rooms.