The contraction of the uterus is physiological and can be caused by external stimulation or fetal movement during pregnancy. In the middle and end of pregnancy, the uterus is more sensitive and contractions will occur after slight stimulation. The regular contractions will appear after the formation of the stomach hardening, there will also be pain, indicating that the baby is to be born performance, in pregnancy reached 38 weeks has entered the pre-term, need to pay attention to the distinction, and then take symptomatic treatment, false contractions do not need to deal with, real contractions should be promptly to the hospital for examination, and then for delivery.