At present, the best birth control ring in China is the Gongxi ring or the memory ring, the two kinds of birth control rings are clinically valid for 15 years, and the contraceptive effect can be as high as 99.6%. Therefore, these two rings are the best at present, and the side effects are particularly low, it is recommended that you can go to the birth control ring for contraception in 3-7 days after menstruation. In addition, there is a relatively good Gini ring or Zimmer ring, in the clinic on the ring does not need to dilate the uterus, but these two kinds of birth control ring may lead to uterine cavity adhesion, or the possibility of uterine perforation. Therefore, it is recommended to use the Memory Ring or the IUD for contraception, and the position of the IUD should be checked regularly after the implantation.