Haloing of the new crown antigen test is usually related to improper operation, swab moisture, too long reading time and other factors, and the test can be re-tested according to the situation. 1. Improper operation: if the operation is carried out under the guidance of non-professionals, the results of the new crown antigen test may appear halo, which needs to be re-opened. 2. Swab moisture: If the swab is of poor quality or has been placed in a humid environment for a long time and is damp, it will not be able to measure accurate results, and needs to be re-tested, and the quality of the swab needs to be checked before the test. 3. Reading data for too long: If the waiting time for antigen detection is too long, more than 20 minutes may appear halo, and it can not be used as a basis for testing, and need to be re-tested. To do the new crown antigen test in the case of not understanding the process, must be carried out under the guidance of a professional physician, so as not to affect the diagnostic results due to improper operation.