The process of painless injection in labor includes positioning, disinfection, puncture and tube placement, fixation, and cardiac monitoring. 1. Positioning: painless injection is labor analgesia, when entering the labor process with the contraction of the pain level increases, labor analgesia can greatly reduce the pain of pregnant women, the most commonly used is intrathecal anesthesia analgesia, need to be operated by professional anesthesiologists. When there is no contraindication after full assessment, you can set up the left lateral position under the guidance of the doctor, and bend your back to facilitate the exposure of the intervertebral space. 2. Sterilization: After choosing a suitable intervertebral space, local sterilization and laying of the cavity towel are carried out. 3. Puncture and tube placement: after local infiltration anesthesia, use the puncture needle to penetrate into the epidural space at the selected puncture site, then place the catheter and push in the analgesic drugs according to the proportion. 4. Fixation: Connect the catheter to the electronic analgesic pump containing drugs, and pump the analgesic drugs into the epidural space continuously and slowly to achieve effective analgesic effect. 5. Cardiac monitoring: cardiac monitoring is needed to monitor the vital signs of pregnant women.