Normally, patients are required to be pregnant for 70 days before they are able to have an abortion, and patients are not recommended to have an abortion for more than 70 days. However, the patient’s gestational sac must be larger than 1.0cm for an abortion, and around 2.0cm is the best time for an abortion. Therefore, it is best to recommend the patient to have an abortion between 40-50 days of pregnancy, this is based on the patient’s menstruation being very regular, and there is no ovulation early or delayed in this pregnancy. If the patient’s menstruation is not regular or if the pregnancy is delayed or detected early, the patient may have ovulation disorders, in which case the timing of the abortion should be chosen according to the size of the gestational sac indicated by the ultrasound. Under normal circumstances, the patient’s uterine cavity when the gestational sac is about 2.0-3.0cm, you can do abortion surgery, too big or too small are not suitable for abortion surgery.