Syphilis serologic test is used to screen and diagnose syphilis by testing the presence of antibodies related to syphilis spirochetes in the blood, including specific and non-specific antibodies, including syphilis spirochete serologic test and non-syphilis spirochete serologic test, as follows: 1. Syphilis spirochete serologic test: belongs to the syphilis confirmatory test, after the syphilis spirochetes invade the body, syphilis spirochetes can appear in the serum Antibodies, and lifelong existence, so if the specific syphilis spirochete antibody positive, means that the patient is now infected with syphilis in the body, may be the need for treatment, or the patient has been infected with syphilis in the past has been cured; 2, non-syphilis spirochete serologic test: belongs to the syphilis screening test, if the results are positive, must need to confirm the test to diagnose syphilis, because a small number of viral hepatitis, autoimmune The test titer change can be used as an indication for treatment observation, recurrence and reinfection.