Abstract: Objective: To investigate the role of 25G intra-needle simple lumbar anesthesia and combined lumbar and rigid anesthesia in cesarean delivery. Methods Forty cases of elective obstetric cesarean section were randomly divided into intra-needle simple lumbar anesthesia group (SA group, n=20) and combined lumbar and rigid anesthesia group (CSEA group, n=20).In the SA group, the L3-4 gap was punctured directly with a 25G intra-needle after routine disinfection and towel laying in the left lateral position, and the subarachnoid space was injected with 2.2 ml of 0.5% bupivacaine, and the plane was adjusted at T6-8 after surgery. Postoperative analgesia: 200 mg tramadol with 0.9% saline 500 ml was infused slowly six hours postoperatively. in the CSEA group, after local anesthesia in the left lateral recumbent position with conventional sterile towel (2-3 ml of 2% lidocaine), L3-4 gap puncture was performed and 0.5% bupivacaine 2 ml was injected into the subarachnoid space, then the epidural was placed 5 cm towards the head and the plane was adjusted at T6-8. ten minutes later, the epidural Postoperative analgesia: postoperative epidural injection of morphine 2mg+gastrofacial 10mg. Observed the onset of anesthesia, anesthesia level, hypotension, chills, dyspnea, postoperative analgesia, postoperative nausea and vomiting, postoperative lumbago and lumbago, as well as the operator’s evaluation of muscle relaxation and maternal comfort with anesthesia. RESULTS: The differences in onset of anesthesia, level of anesthesia, dyspnea, postoperative analgesia, and operator’s evaluation of muscle relaxation and maternal comfort with anesthesia were not statistically significant (P>0.05). the rates of chills and postoperative nausea and vomiting were higher in the SA group, but the rates of hypotension and postoperative lumbar pain were lower. Conclusion: There is no statistically significant difference between the anesthetic effect of intra-needle simple lumbar anesthesia (SA group) and combined lumbar and rigid anesthesia (CSEA group) (P>0.05), while intra-needle simple lumbar anesthesia (SA group) has the advantages of perfect block, fast onset of action, small amount of local anesthetics, less damage to human tissues, and significantly reduced postoperative lumbar pain. Keywords: 25G intra-needle simple lumbar anesthesia, combined lumbar and rigid anesthesia, obstetrics and gynecology, elective cesarean section, postoperative analgesia Data and methods – General data: 40 cases of women who were to undergo cesarean section, all aged between 23 and 30 years, without comorbidities, weighing between 50 kg and 70 kg, with gestational weeks between 38 and 42 weeks, were randomly divided into two groups of 20 cases each. Each group had 20 cases. – Anesthesia method: SA group: (intra-needle needle simple lumbar anesthesia group) Subarachnoid injection of 0.5% bupivacaine 2.2ml CSEA group: (combined lumbar and epidural anesthesia group) Subarachnoid injection of 0.5% bupivacaine 2ml Ten minutes later, additional epidural 0.5% levobupivacaine 5ml Postoperative analgesia Six hours after surgery in SA group, 200mg tramadol with 0.9% saline 500ml was administered slowly. 500ml of saline was infused slowly. CSEA group Postoperative epidural injection of morphine 2mg + gastrofacial 10mg Results Both groups achieved better anesthetic results. Apgar scores of born newborns were above 8 in the first minute and 10 in the fifth minute. No postoperative headache occurred in any case. Discussion There is no statistically significant difference between 25G intra-needle needle simple lumbar anesthesia for cesarean section and combined lumbar and rigid anesthesia (P>0.05) The study showed that: 25G intra-needle needle anesthesia with a small amount of local anesthetic has less damage to human tissues, and postoperative lumbar pain is significantly reduced, but there is no statistically significant difference between the anesthetic effect and combined lumbar and rigid anesthesia (P>0.05) Our results showed that: 25G intra-needle needle Lumbar anesthesia alone can reach T8.0±0.2 cm anesthesia level in the 10th minute can start the operation. Conclusion There is no statistically significant difference between the anesthetic effect of 25G intra-needle simple lumbar anesthesia (SA group) and combined lumbar and rigid anesthesia (CSEA group) by comparison (P>0.05), while 25G intra-needle simple lumbar anesthesia (SA group) has the advantages of perfect block, fast onset of action, small amount of local anesthetic, small damage to human tissues, and obvious reduction of postoperative lumbar pain.