This kit works by immune chromatography. The sample moves with capillary action to move forward along the test card. If the sample contains novel coronavirus antigen, the antigens will bind with colloidal gold labeling will be coronavirus monoclonal antigen, the immune complex will be membrane fixed will be coronavirus monoclonal antibody capture, form the purple line, display will be coronavirus antigen positive; If the line does not show color, the negative result will be displayed. The test card also contains a quality control line C, which shall appear in magenta regardless of whether there is a detection line.