The contraceptive pill has been in clinical use for more than 50 years, and its introduction has changed the whole situation of birth control technology and family planning, which afterwards is an important part of reproductive health. At present, short-acting oral contraceptives have become one of the most important forms of contraception in developed countries, while their application in China is really unsatisfactory. In fact, modern oral contraceptives are effective, safe, reversible and not related to sexual life, especially suitable for unmarried women who have sex and temporarily do not have children after marriage. Short-acting oral contraceptive pill contraceptive mechanism: 1. inhibit ovulation; 2. change the physical and chemical properties of the cervical mucus, which is not conducive to the passage of sperm; 3. change the morphology and function of the endometrial tissue, which is not conducive to the fertilization of the egg; 4. change the peristaltic speed of the fallopian tube, so that the operation of the fertilized egg and the development of the endometrium are not synchronized Suitable for: 1. unmarried women or menstruating women, especially for unmarried women who have sex and are not planning to have children after marriage; 2. 2, for miscarriage, especially infected miscarriage can start taking immediately after the abortion is conducive to post-abortion recovery; 3, for chronic pelvic inflammatory disease has a preventive effect; 4, can relieve dysmenorrhea, reduce the symptoms of endometriosis Caution: 1, age greater than 40 years, such as no risk of cardiovascular system disease can be applied to menopause, but need to strengthen the physical examination; 2, breastfeeding can reduce the amount of milk; 3. Women with a body mass index greater than 30; 4, unexplained bleeding in the reproductive system should be used with caution Discontinued groups: 1, age greater than or equal to 35 years, smoking greater than or equal to 15 cigarettes per day; 2, within 3 weeks after childbirth, whether or not breastfeeding; 3, blood pressure greater than 140/90mmHg; 4, a history of thrombosis; 5, abnormal liver and kidney function; 6, diabetes combined with vascular disease Advantages: 1, the correct use of contraceptive rate The contraceptive rate can reach 99.95%, with good reversibility and quick recovery of reproductive function after stopping the pill; 2, wide range of use, does not affect sexual life; 3, can reduce ectopic pregnancy, reduce the occurrence of functional ovarian cysts and pelvic infections; 4, reduce the occurrence of ovarian cancer, endometrial cancer and benign tumors of the breast; 5, can make the menstrual cycle regular, reduce the volume of menstruation, shorten the period, reduce dysmenorrhea, and treat menstrual disorders; 6, the second and third generation contraceptives have the ability to improve acne. The second and third generation contraceptives have the effect of improving acne, hirsutism and seborrheic dermatitis Disadvantages: 1, need to take the pill daily, easy to miss; 2, some women will experience nausea, breast swelling, weight gain and spot bleeding and other side effects; 3, long-term (more than 5 years) increased cardiovascular risk such as venous thrombosis; 4, hypertension, age greater than 35 years old smoking women after taking the pill increased risk of cardiovascular disease; 5, with other Some of the drugs used at the same time, can reduce the effectiveness of contraception