It is not easy to detect positive syphilis in pregnant women; there are many patients with clinical manifestations of latent syphilis. Patients do not have any clinical symptoms of syphilis infection, so they do not know that they have it. However, it is only during pregnancy preparation or early pregnancy checkups that they discover that they have previously been infected with syphilis or are currently infected with syphilis. Other causes include unclean sex, because syphilis is basically caused by sexual contact, so unclean sex is a key factor in syphilis infection. In addition, syphilis germs can also enter the body of pregnant women through the skin, mucous membrane fissure wound, ambush for a few days, until the pathogenic bacteria breeding hair Ou sufficient number of disease can begin to develop.