However, a very small number of women who have been ligated for a long time and have chosen to be ligated in a severed way will have more difficulty in recanalization, or even cannot be recanalized, because serious local adhesions have occurred and can no longer be recanalized. At present, if the ligation is performed without cutting off, it can effectively improve the probability of recanalization. Female ligation is a better contraceptive method, and the contraceptive rate is close to 100 percent. The principle of female ligation is performed 3-5 days after menstruation, mainly to effectively prevent the occurrence of infection, avoid sexual intercourse before and after the operation, pay attention to more rest, avoid staying up late, and strengthen nutrition to prevent the healing of the wound.