ObjectiveTo explore the anesthetic effect of Ropivacaine at different concentrations by subarachnoid block in cesarean section.MethodsFrom January 2016 to February 2017,120 pregnant women undergone cesarean section were enrolled as research objects.According to the different therapeutic methods,the patients were evenly divided into high concentration group(0.5%)and low concentration group(0.375%),60 cases in each group.In the high concentration group,Ropivacaine in a high concentration via subarachnoid block was used,while in the low concentration group,a low concentration Ropivacaine via subarachnoid block was adopted.The anesthetic effect,the onset time and sustained time of motor block,the onset time and sustained time of sensory block,and incidence of adverse reaction in the two groups were compared.ResultsThe anesthetic effects were compared between the two groups,the differences were not significant(P＞0.05).The the onset time of motor block and sensory block were compared between the two groups,the differences were not significant(P＞0.05).However,the sustained time of motor block and sensory block in the low concentration group was shorter than those in the high concentration group,the differences were statistically significant(P＜0.05).The incidence of adverse reactions in the low concentration group was less than that in the high concentration group,the difference was statistically significant(P＜0.05).ConclusionThere is no significant difference in the anesthetic effect between low and high concentrations of Ropivacaine in the treatment of cesarean section by subarachnoid block.Although the sustained time of block is short,the adverse reactions are few and the safety is high,which is worthy of promotion.