The use of oxytocin in late pregnancy is routine. I. Indications: 1. planned delivery with normal fetal heart sounds and fetal position without obvious cephalopelvic disproportion; 2. coordinated contraction weakness (including primary and secondary) in accordance with the above conditions; 3. stillbirth and abnormal fetus in normal fetal position without obvious cephalopelvic disproportion. Contraindications: 1. obvious cephalopelvic disproportion; 2. severe cardiopulmonary insufficiency; 3. scarred uterus, post hysterectomy of residual angle, post hysterectomy of horn pregnancy; 4. abnormal fetal position, such as transverse position, compound previa; 5. intrauterine distress or severe placental hypoplasia; 6. uncoordinated weak uterine contractions; 7. spastic stenotic ring of uterus; 8. pelvic stenosis and soft obstruction; 9. oxytocin History of allergy. Caution: 1, excessive elongation of the uterine body (huge baby, excessive amniotic fluid, multiple pregnancy) without rupture of membranes; 2, breech position; 3, multiple births, advanced primigravida; 4, vaginal examination, cervical Bishop score and exclusion of pelvic stenosis are required before using oxytocin. V. Method of use (infusion pump): first adjust 8 drops/min, add 2.5U of oxytocin into 5% G.S 500ml, so that each drop of sugar solution contains 0.33U of oxytocin, starting from 8 drops/min increase 5 drops/min every 15~30 minutes as needed, maintain contractions for 30~40 seconds/3~5 minutes, uterine cavity pressure above 50~60mmHg, interval between contractions cannot be less than 1 minute If the contractions are not effective, increase the concentration of oxytocin to within 1%, not more than 40 drops/min, and the concentration of oxytocin can be 1% when the contractions are weak. Indications for immediate discontinuation of oxytocin: 1. signs of pre-uterine rupture or uterine rupture: unexplained vaginal bleeding and sudden acceleration of pulse, slow or absent fetal heart sounds, hematuria, pathological contraction ring, sudden weakening or disappearance of contractions; 2. contractions too strong, too frequent, spasmodic contractions; 3. transient hypotension; 4. allergic reactions: chest tightness, shortness of breath, irritability, chills, urticaria, shock; 5. fetal heart rate Monitoring suggests intrauterine distress; 6. Suspected amniotic fluid embolism. 7, precautions: 1, induction of labor can only be static drops, not intramuscular injection, cavity injection or mucosal administration: the sensitivity threshold of oxytocin individual differences, try to control the number of drops with an infusion pump, and a person to look after, continuous fetal heart monitoring until delivery. 2.After reaching the effective concentration, adjust the number of drops according to the contractions in time to maintain effective contractions; 3.If the induction of labor is unsuccessful at 17:00 on the same day, the induction of labor should be stopped, so that the mother rests and continues the next day, the induction of labor for three consecutive days is not effective and is regarded as a failure of induction of labor; 4.For those who cannot be relieved by stopping the oxytocin, 25% MgSO4 16ml plus 5% Glu 10ml can be used for static pushing (5 minutes) 5.If oxytocin allergy occurs, stop using it immediately and provide anti-allergic treatment; 6.Pay attention to labor monitoring, dilatation of the uterine orifice, precordial descent, fetal heartbeat, maternal blood pressure, pulse, urine output, etc.; 7.A daily intake of ≤1000ml is appropriate to prevent water intoxication (oxytocin has similar antidiuretic hormone effect), large doses of oxytocin can cause increased blood pressure and water retention, etc. Routinely use 5% G.S.