There is a wide range of contraceptive methods available, but all of them do not have a 100% success rate, and all of them have certain risks. Now the common domestic contraceptive methods are the following. A, tool contraception tool contraception is also known as barrier contraception, as the name implies that is to use the barrier to block sperm, prevent sperm-egg combination, in order to achieve the purpose of contraception. The most common contraceptive tool is the male condom, the contraceptive rate is about 97%, for all ages of reproductive age people are applicable, want to effective contraception need to pay attention to the following points: 1, each sexual intercourse must be used, and must be worn in a timely manner before the start, not before ejaculation; 2, each use of a new condom, and to use the shelf life of the newly opened condom; 3, choose the right number. Before use, pinch the top sperm storage sac to avoid scratching the condom with nails and other sharp objects; 4. After ejaculation, before the penis is soft and shrunken, press the condom mouth to withdraw as soon as possible to avoid the chance of sperm entering the uterine cavity. Tool contraception also includes female condoms and external spermicide, both uncommon in China. Second, short-acting oral contraceptive pill Short-acting oral contraceptive pill is a low dose of estrogen and progestogen compound, the contraceptive mechanism is to inhibit ovulation, change the state of cervical mucus and endometrium, and can create regular withdrawal bleeding, healthy women of childbearing age are suitable, for menstruation, menstrual disorders, endometriosis, adenomyosis, premenstrual tension syndrome patients are particularly suitable, can reduce dysmenorrhea It can reduce dysmenorrhea and menstrual flow, and improve premenstrual tension. It is not recommended for women aged ≥ 35 years, smoking, breastfeeding, breast cancer, and women with cardiovascular disease. Short-acting oral contraceptives are available in various commercial types, and different preparations have different characteristics. For example, the progestin component of Da-Ying-35 is cyproterone, which has an antagonistic effect on androgens, and the progestin component of Eusebio is drospirenone, which has an anti-sodium retention effect. Many women talk about hormones and believe that there are many side effects, especially many young women who are afraid of gaining weight from taking birth control pills. In fact, the dose of estrogen and progestin in short-acting oral contraceptives is very low, and the side effects are minimal for people without high-risk factors. Weight gain is usually temporary, mainly due to water and sodium retention caused by estrogen. The contraceptive rate of short-acting oral contraceptives can reach 99%, to ensure the effectiveness of contraception, the main need to do every day on time to take the pill, to prevent leakage. Third, the long-acting oral contraceptive pill and long-acting contraceptive injection The contraceptive mechanism of these two contraceptive methods are to inhibit ovulation, the same population and short-acting oral contraceptive pill, characterized by long-acting, free from daily dosing, but because the dose is larger than the short-acting contraceptive pill, so after stopping the pill can not immediately resume ovulation, and cause menstrual disorders side effects are more common, therefore, these two contraceptive methods are currently less people use. In the case of Chi Ming and Chun Jiao, Chun Jiao and her ex-boyfriend Jia Hao use the contraceptive method is the long-acting contraceptive injection. Fourth, the emergency contraceptive pill The emergency contraceptive pill is a remedy, also known as the morning-after pill, the main role is a large dose of hormone interference with the lining to prevent embryonic implantation, but the success rate of emergency contraceptive pills is very low, only about 75%, and large doses of hormones may cause menstrual disorders, so it is not recommended, not to use as a regular method of contraception. The success rate can be improved by taking the pill as soon as possible after unprotected intercourse. Five, subcutaneous implant contraception subcutaneous implant contraceptive device with silicone rubber as the carrier, buried under the skin at a constant rate of slow release progestin to achieve the purpose of contraception. The main population is the same as the short-acting oral contraceptive pill, but women who smoke can also be used, valid for three years, the main side effect is menstrual disorders. The main side effects of IUD are pain, heavy menstruation, menstrual disorders, rare but serious side effects are damage to the uterine wall, and even penetrate the uterus, so The IUD, if complicated by pregnancy, may be due to IUD displacement, or the placement of undetected pregnancy, may also be in situ with device pregnancy, it is generally recommended to terminate the pregnancy, while removing the IUD. VII, safe period contraception Safe period contraception is mainly through various methods to calculate female ovulation, avoiding the date of easy conception, not easy to conceive the day that is The safety period is only applicable to women with regular menstrual cycles, and the calculation of the safety period requires systematic training, and the success rate is not high, therefore, this method is not recommended for effective contraception. Eight, in vitro ejaculation because before ejaculation, a small amount of semen has been discharged into the vagina, so the success rate of this method of contraception is not high, and is not recommended. The success rate of contraception can reach 99%, but there is a risk of infection, bleeding, damage to nearby organs and the possibility of failure of recanalization. Nowadays, the street, TV and internet are full of advertisements for painless abortion, but in fact, abortion surgery is very harmful and risky for women, as described in the previous articles. Therefore, the remedy of contraceptive failure should not be considered as a regular form of contraception, and the standardized use of contraceptives is the correct method for effective contraception.