Negative pressure suction has the advantage of short operation time, less bleeding, and easy to control the negative pressure, the disadvantage is that it may damage the endothelial basal layer, resulting in low menstrual flow or even amenorrhea, uterine adhesions, secondary infertility, uterine perforation, pulling the cervical vagus nerve excitement caused by pallor, decreased blood pressure and cardiac arrhythmia, etc, but the vast majority of them are not a problem, and the chances of the occurrence of the above mentioned anomalies are extremely low. It is recommended to go to the regular hospital, try to avoid multiple abortions, reduce the operation of the uterine cavity, reduce the chance of abnormal pregnancy, need to pay attention to hygiene after the operation, do not take a bath, sit in the bath, forbid sex for a month, observe the bleeding and menstrual flow, bleeding or accompanied by fever and abdominal pain, you need to consult the doctor at any time, the delay of menstruation for more than a week, you need to check the ultrasound to see the thickness of the endothelial lining and the condition of the uterine cavity to understand the possible adhesion of the uterus. The delay of menstruation for more than one week should be checked by ultrasound to see the thickness of the endometrium and the condition of the uterine cavity to know whether there is any possibility of adhesion.