Neocoronavirus antigen testing should not be done with saliva as it can lead to inaccurate results. In the new coronavirus antigen test, should take a nasal swab sampling method for sampling, and need to strictly follow the operating procedures for sampling and testing. The specific operation method is that the detector first use toilet paper to wipe off nasal mucus, head slightly tilted up, one hand to take the end of the nasal swab, slowly the nasal swab into one side of the nasal cavity, deep into the nasal cavity length of about 1.5cm, gently rotate the 4 weeks or so, one side of the nasal cavity of the operation time should not be less than 15 seconds, and then use the same swab on the other nasal cavity to repeat the same operation. According to the instructions of the reagent, the nasal swab was placed in the sampling tube immediately after sample collection, and the swab head should be rotated and mixed in the preservation solution for at least 30 seconds, and the swab head should be squeezed at least 5 times by hand through the outer wall of the sampling tube to ensure that the samples were sufficiently eluted in the sampling tube. The swab is then discarded after the swab head has been squeezed dry by hand against the outside of the sampling tube. After capping the tube, drop the liquid vertically into the sample hole of the test card. Wait for a certain period of time for the results to be interpreted according to the reagent instructions. When performing the new coronavirus antigen test, the tester should strictly follow the operational procedures for sampling and testing, so as not to affect the test results.