Six-month induced abortion is usually performed by transabdominal wall amniocentesis, the steps are as follows: I. Preoperative preparation: including vital signs measurement (blood pressure, pulse, temperature, etc.), gynecological examination to pay attention to the presence or absence of pelvic tumors, uterine deformities, etc.; II. Blood sampling, laboratory tests and related examinations: routine blood tests plus blood type, coagulation function tests, liver function tests, urinalysis, B-type ultrasound and electrocardiograms; III. Puncture site localization, which can be performed by manipulation and B-type ultrasound localization; IV. Positioning and B-type ultrasound localization; four, before puncture, empty the bladder, abdominal skin disinfection, laying a sterile porous towel; five, select the puncture needle, there are two resistance breakthrough sensation, said to enter the amniotic cavity, pulling out the core of the needle amniotic fluid overflow, can be injected into the 100mg of izacrine; six, the core of the needle inserted into the puncture needle, quickly pull out the needle, put on the sterile dry gauze, after five minutes of pressure and fixation.