Nucleic acid test generally refers to the new crown nucleic acid test, nucleic acid test swabs are put together is to carry out a mixed test. Putting multiple people’s nucleic acid test swabs together is called a mixed test for nucleic acid. Compared to single test, mixed test is more suitable for multiple people and collective screening, and it can also improve the speed of nucleic acid test and reduce the cost burden of nucleic acid test for the government. In the case of small-scale outbreaks, mixed testing combined with single testing is usually used, i.e., mixed testing of nucleic acids for the general public is used to improve the efficiency of screening, and for positive mixed test results, individuals in the mixed group will be tested separately to identify true positive infected persons. At present, China’s implementation of up to 20 in 1 mixed test, can greatly improve the efficiency of detection, applicable to a larger population nucleic acid screening, if the nucleic acid test appears positive, we should go to the hospital in a timely manner to report, do not hide, or will have to bear the corresponding criminal responsibility, and actively cooperate with the isolation of the treatment, do not be negligent, so as to avoid affecting their own health and the health of others.