The use of the pill not only has no adverse effects on women’s reproductive function, and even has a significant protective effect, mainly through the following aspects of direct or indirect effects: 1, women adhere to and correct use of the pill, the pregnancy rate in the first year is only 0.3 / 100 women years, can effectively avoid unintended pregnancy and abortion, especially repeat abortion, which is the best protection of women’s reproductive function. 2, the contraceptive pill can effectively reduce the risk of pelvic inflammatory disease. The main mechanism is that the pill can increase the viscosity of cervical mucus and stop the upward movement of pathogenic microorganisms in the lower genital tract. On the other hand, the pill can inhibit the endometrium, reduce the volume of menstruation, and reduce the risk of pelvic inflammatory disease due to menstrual blood reflux. Foreign observations show that taking the pill can reduce the incidence of pelvic inflammatory disease by 50% to 60%; not only that, in the pelvic inflammatory disease diagnosed by laparoscopy, the degree of inflammatory response is slight in the pelvic inflammatory disease that occurs during the taking of the pill. 3, contraceptive pills can effectively prevent the occurrence of ectopic pregnancy. The main mechanism is that the pill can almost completely inhibit ovulation and can effectively interfere with fertilization. The pill can reduce the incidence of ectopic pregnancy by 90%, and the literature reports that the incidence of ectopic pregnancy among pill users is only 0.005 per 1,000 woman-years, which is similar to that of women whose partners use vasectomy contraception, and much lower than that of women who use condoms, vaginal diaphragms, copper intrauterine devices and tubal sterilization. The strong contraceptive effect of the pill C makes it possible to have a very low incidence of ectopic pregnancy even if contraception fails. In addition to these direct effects, the pill protects reproductive function by reducing the risk of endometrial and ovarian epithelial cancers (ovarian cancer).