The uterine contraction needle has the effect of promoting the contraction of the smooth muscle of the uterus and is used in different ways and in different application scenarios depending on the purpose of application.1. Intravenous infusion: If there is no prodromal episode at 41 weeks of pregnancy or if no regular contractions appear 2 days after the water breaks, the uterine contraction needs to be induced by an injection of the uterine contraction needle, usually in a vein in the hand. Venipuncture needles can also be moved to the back of the pregnant woman’s hand during labor when the uterine contractions are weak and used to augment the lack of uterine contractions, avoiding intramuscular injections at this time. Contractions, fetal heart monitoring, blood pressure and changes in labor should be closely observed after use, and a person should be on guard to observe the application process; 2. Gluteal injection: If it is used for weak uterine contractions after delivery, it can usually be injected directly into the gluteal area to prevent uterine bleeding after delivery. At this time, the first choice is to inject in the gluteus maximus, followed by the gluteus medius and gluteus minimus; 3, direct injection in the body of the uterus: after the delivery of the fetus during cesarean delivery, the uterus can be injected directly into the body of the uterus intramuscularly to promote uterine contraction and prevent postpartum bleeding. Some mothers may experience nausea, vomiting, increased heart rate or arrhythmia after using contraction injection, so it is prohibited for those with obstructed birth canal, obvious cephalopelvic disproportion and transverse birth; it should be used with caution before delivery for those with heart disease, history of cesarean section, history of myomectomy and breech birth.