Pallid spirochete is syphilis spirochete, syphilis spirochete is the pathogen of syphilis, only infects human beings, and human beings are also the only source of syphilis infection. Syphilis spirochetes are elongated, about 0.5~3um long, shaped like fine springs, with regular spiral bends, an average of 8~14, and straight pointed ends. Under the electron microscope, the syphilis spirochete is divided into outer membrane, axoneme and cylindrical bacterium, the outer membrane consists of proteins, sugars and lipids, the axoneme is mainly composed of proteins, and the bacterium consists of the cell wall, cell membrane and cytoplasmic contents. Syphilis spirochetes are sensitive to drying, chemicals, temperature and penicillin and other drugs, usually die in 41 ℃ in 1 hour, drying 1~2 hours away from the body to die. Syphilis spirochetes are transmitted through blood, sex and mother-to-child transmission, and penicillin is the drug of choice for syphilis treatment. If the diagnosis of syphilis should be timely consultation, standardized treatment under the guidance of specialists.