There are many reasons for false positive antigen, such as improper operation, specimen contamination, vaccination and other factors. 1. Improper operation: for example, improper operation or not using the reagent kit in time after opening, judging the result too early or too late. 2. Contaminated specimen: In the process of collecting specimen, the specimen is contaminated, which can also cause false-positive antigen. 3. Injection of vaccine: the vaccine is injected by the collected person, and the antigen test is carried out within 48 hours, which may also cause the test result, false positive. Positive test results, need to further go to the hospital to complete the new crown nucleic acid test to determine whether it is false-positive, or infected with the new crown virus, early detection, as soon as possible, in accordance with the doctor’s advice to take the appropriate treatment, isolation measures.