The antigen test of Mycoplasma pneumoniae generally uses the principle of antigen antibody reaction. It mainly collects secretions from nasopharyngeal swabs, dissolves them in buffer, and drops the liquid into the test card for self-test. If the patient is infected with Mycoplasma pneumoniae, the "C" and "t" lines of the test card show positive, and the operation is convenient and fast. The patient can self test at home to avoid cross infection in the hospital. The results can be obtained in 15 minutes.