Before doing the nucleic acid test, you should pay attention to avoid eating within 2 hours, keep your mouth clean, prepare a mask, keep a distance from the queue and pay attention to the general knowledge of collection. 1. Two hours before the nucleic acid test, it is recommended that people with over-sensitive throat should avoid eating as much as possible, so as not to cause vomiting during sampling. 2. 30 minutes before sampling, it is best to rinse and clean the mouth, do not drink alcohol, beverages, smoking, chewing gum and so on. 3. Before collecting the nasopharyngeal swab, the examinee should inform the staff whether he/she has any past medical history, such as curvature of the nasal septum, history of nasal surgery, pharyngeal diseases, blood diseases, etc., and whether he/she is taking anticoagulants. 4. Wear the mask properly before going to the nucleic acid testing site, remove the mask during testing, and put it back on immediately after testing. To minimize the risk of cross-infection, you can also bring a spare mask with you and change it immediately after you leave the testing site after sampling. 5. Attention should be paid to hand hygiene before and after the nucleic acid test, and alcohol can often be used to wipe hands. 6. Before the test, fill in the identity information on the WeChat program and generate the nucleic acid test code, and if necessary, carry identity documents to the test site. These are the things that must be noted before the nucleic acid test, go to the sampling site, should also pay attention to line up, do not cut in line, keep 1 meter distance, listen to the staff’s arrangements.