Contraction injections are usually given after a miscarriage or after childbirth when the uterus is not contracting well, to help the bruising drain and promote a speedy recovery of the uterus. The time to drain the bruises with the injection depends on the application background as well as the patient’s own situation. I. Application after abortion: after abortion surgery or drug abortion pregnancy capsule is discharged, the uterine contraction injection will be applied to promote uterine contraction and discharge the bruise, usually 3-5 days to completely discharge the bruise. Second, after delivery, when the uterus contraction is not good: 1, no complications and postpartum bleeding: the use of contraction needle to expel the bruises, it may only take 1-2 days; 2, the presence of other abnormal conditions: such as postpartum hemorrhage, placenta praevia or unsuccessful delivery, placenta drainage and other conditions exist, then the application of contraction needle, it may take 3-7 days to completely expel the bruises. For different patients, it is necessary to analyze the specific situation. To promote the expulsion of blood stasis, you should not rely on the contraction injection alone, but also cooperate with other drugs to promote blood circulation and eliminate blood stasis, such as motherwort granules and biochemical soup pills, which should be taken under the guidance of the doctor. In addition, appropriate walking should be done to promote the discharge of blood stasis. After delivery, women should actively breastfeed to promote the discharge of bruised blood through the neurohumoral reflex, which will strengthen the contractions. If the bruised blood is still not completely discharged after 7 days, ultrasound examination should be performed promptly to understand the condition of the uterus and to consider the possibility of poor uterine recovery or residual uterine cavity, and follow the doctor’s instructions for the next treatment.