Before the two-cancer screening, one should avoid menstruation, coitus and vaginal medication. The screening of two cancers generally refers to the screening of breast cancer and cervical cancer. Since the examination of breast and cervix will be affected by the menstrual cycle and hormone level, it is generally recommended to conduct the examination 3-7 days after the menstrual period is cleared, and the screening of cervical cancer generally chooses liquid-based cytology, and try to avoid coitus and vaginal medication one week before the examination so as to avoid influencing the result. Breast cancer screening usually chooses color ultrasound, and cervical cancer usually chooses cervical scraping and TCT (Thin Layer Liquid-Based Cytology), when the result is abnormal, it is necessary to carry out further puncture or pathology biopsy to confirm the diagnosis and then further treatment.