I. Indications (1) Anyone who is 14-27 weeks pregnant and wants to terminate the pregnancy. (B) Those who are not suitable to continue pregnancy due to certain diseases. Contraindications (A) Cardiac, hepatic, renal and pulmonary disorders in the active stage or those with obvious dysfunction. (B) Acute stage of various diseases. (C) Surgical scars on the uterine body, old fissures on the cervix, uterine dysplasia should be used with caution. (D) Those with acute inflammation of the reproductive tract or skin infection at the puncture site. (E) Those with body temperature above 37.5℃ twice within 24 hours before surgery.