Since the outbreak of the new coronavirus outbreak in 2020, 'nucleic acid testing' has begun to recur as an important indicator to detect the presence of infection.2022 On March 10, 2022, the State Council's Integrated Group for Joint Prevention and Control Mechanism in Response to the New Coronavirus Pneumonia Outbreak issued a notice deciding to promote the testing model of 'antigen screening and nucleic acid diagnosis', adding antigen testing as a complement to nucleic acid testing.2023 What is antigen testing?What is antigen testing? How does it differ from other tests? In this article, we will talk about the common rapid screening tools, the principles and the scope of application, taking the novel coronavirus as an example.