The new crown self-test kit is mainly through the oropharynx or nasal collection of samples put on the test plate to determine the negative and positive a reagent. Only four steps to complete the test, the following nasal sampling as an example of the specific use of the method is described below. 1. The patient first opens the package, take out the test box, test solution and disposable cotton swabs of the three test items, check whether there is damage. 2. Then wash your hands and clean up the nasal cavity to ensure that the nasal cavity is smooth and free of foreign objects. 3. Use your hand to insert the cotton swab into the nasal cavity for sampling, insert the swab into the left nasal cavity about one point five centimeters, rotate it about 4-5 times, and then insert it into the right nasal cavity to repeat the same action. 4. After sampling, the end of the cotton swab with nasal secretion is fused with the test solution and withdrawn from the swab, and the special cap of the test solution is put on. Then drop it into the round hole under the test box, about 4-5 drops, and then leave it for about 10 minutes to wait for the result. If one bar is displayed, the result is negative; if two bars are displayed, the result is judged positive. The new crown antigen test kit is easy to use and can be done by individuals at home. The product can be used to sample oropharyngeal swabs and nasopharyngeal swabs, and the results can be ready in as little as 10 minutes. However, antigen testing cannot completely replace nucleic acid testing. The National Health Commission emphasized that nucleic acid testing is still the basis for confirming new coronavirus infections, while antigen testing can be used as a complementary tool for screening specific populations.