An oxytocic balloon is a form of labor induction that needs to be combined with a contraction to induce labor. A reaction will occur in about 24 hours after placement, depending on the individual’s constitution. Generally speaking, after placing the balloon, the reaction will start within 24 hours, but some pregnant women may have a delayed or early reaction time after placing the balloon, depending on the physical condition of the pregnant woman. When the balloon is placed to induce labor reaction pregnant women will suddenly feel abdominal pain, waist has obvious swelling feeling, belong to the contraction performance. If there is no response within 24 hours, it is recommended that the balloon be removed as soon as possible to prevent bacterial infection. During the placement of the balloon, it is necessary to calm the pregnant woman, and if there is any adverse reaction, the doctor will take the best way to terminate the pregnancy according to the individual situation.