OBJECTIVE： To investigate the effects of small dose of bupivacaine lumbar-epidural block on related indexes in women underwent cesarean section. METHODS： 124 singleton term primipara underwent elective cesarean section were randomly divided into observation group （62 cases） and control group （62 cases）. Observation group received 0.5％ bupivacaine 7.5 mg lumbar anesthesia+1.6％ lidocaine epidural block. Control group received 0.5％ bupivacaine 10 mg lumbar anesthesia+1.6％ lidocaine epidural block. HR， SBP， DBP， onset time of sensory block， fixation time of block level， operation start time， the occurrence of traction reaction and supine hypotensive syndrome， the application of ephedrine， Apgar score the occurrence of ADR were observed in 2 groups before anesthesia （T0），1 （T1），3 （T2），5 min （T3） after anesthesia， at skin incision （T4）， after fetal disengagement （T5）. RESULTS： There was no statistical significance in HR， SBP and DBP between 2 groups at T0（P＞0.05）. There was no statistical significance in HR， SBP and DBP of observation group at different time points （P＞0.05）. At T1-3， SBP and DBP of control group were significantly lower than at T0 and observation group； HR was significantly higher than at T0 and observation group， with statistical significance （P＜0.05）； there was no statistical significance in HR，SBP and DBP of control group，compared to at T1-3（P＞0.05）； there was no statistical significance in above 3 indexes of control group at T4-5， compared to at To and observation group（P＞0.05）. The onset time of sensory block， fixation time of block level and operation start time in observation group were all longer than control group； the incidence of supine hypotensive syndrome， the number of ephedrine cases， the amount of ephedrine， the incidence of nausea and vomiting，the incidence of postoperative urinary retention were significantly lower than control group； the incidence of traction reaction was significantly higher than control group， with statistical significance （P＜0.05）. There was no statistical significance in  the incidence of respiratory depression，Apgar score，overall incidence of ADR between 2 groups （P＞0.05）. CONCLUSIONS： The small dose of bupivacaine lumbar-epidural block  for women underwent cesarean section keep hemodynamics stable and reduce the incidence of supine hypotensive syndrome without increasing the incidence of ADR.