Syphilis is a venereal disease that can be transmitted in three ways. 1. Sexual transmission: The highest peak of infection is reached within 1-2 years after sexual contact between the two parties, and the infectiousness gradually decreases in the fourth year. This is the first, through the sexual transmission route to spread, especially in young people, this bad life contact can lead to syphilis infection. 2, mother-to-child transmission: mother-to-child transmission is mainly the mother is syphilis patients, in pregnancy is not standardized use of anti-syphilis drugs, and thus infected to the child. Some children can also transmit the disease through the birth canal during natural childbirth. 3, blood transmission: the most common is transmitted during blood transfusions, now the blood transfusion inspection is very strict, in the blood donor and during the blood transfusion can be screened for syphilis. 4, medical transmission: some syphilis patients in the process of surgery, and sometimes even through saliva, handshake way to normal people.