OBJECTIVE Compare the outcome of barbotage and sigle injection applied to spinal anesthesia in cesarean section, include sensation blockeffect, motor block effect, changes of maternal hemodynamics, neonatal Apgar scores. METHOD One hundred ASAⅡparturients of 20-40 years with full-term pregnancy were scheduled for cesarean delivery under L2-3 CSEA were included. They were randomly divided into 2 groups with 50 cases each. 0.5% Ropivacaine 2.2mL(11mg) were used in all patients. A barbotage technique was carried out in group B: 1st step, inject 1.1mL from 2.2mL total solution and withdrawing back to 2.1mL; 2nd step, inject 1.1mL from 2.1mL solution and withdrawing back to 1.6mL; 3rd step, inject 1.1mL from 1.6mL solution and withdrawing back to 1.1mL; 4th step, inject the rest solution into subarachnoid space. The total injection time of group B is 44s with an average speed of 0.1mL/s. Single injection is carried out in group S within 22s and average speed of 0.1mL/s. Use dopamine and phenylephrine to stabilize maternal circle system, and top up local anesthetics if needed. Record maternal blood pressure, heart rate, level of sensory block, Bromage score, usage of vasoactive drugs and local anesthetics at time of resting and 4min, 6min, 8min, 10min after injection. Record perioperative adverse reaction and condition of newborns. RESULT The rate of block sensory level rise: B>S(P<0.05); within t4, the highest sensory block level: B>S(P<0.05); the usage rate of phenylephrine: B0.05). CONCLUSION In the spinal anesthesia of cesarean section, Barbotage provides wider distribution of local anesthetics in subarachnoid space, which lead to faster nerve block and higher block level, with more stable blood pressure and heart rate.