Rapid detection of antigen refers to the application of new coronavirus nucleocapsid protein-specific antibodies in the direct detection of pathogens in a sample, the result can be used as direct evidence of early identification of infection the pathogen or not, detecting a rapid (15min), convenient operation of the New coronavirus detection method. Applicable scenarios: Weak nucleic acid detection capabilities, insufficient detection capabilities, and places where urgent results are needed. It has been widely used in Europe, America, Asia, Africa and other regions, and together with nucleic acid testing has become an important detection method for the prevention and control of the COVID-19 epidemic.