Abstract: [Abstract] Objective To assess the anesthetic effect of different concentrations of hyperbaric ropivacaine used in lumbar anesthesia for elderly transurethral prostatic resection. Methods We randomly divided58elderly patients who un? derwent transurethral prostatic resection with ASA (American Surgical Association) physical status level Ⅰ- Ⅱ into 2 groups as group A and B, using numeric random table method. Each group includes29cases. After being punctured between L3-L4, patients were injected with 0.5% (group A) and0.75%(group B) hyperbaric ropivacaine (diluted with10% glucose) to the subarachnoid space in a speed of 0.1-0.3mL/s and the overall dose was12.5mg in each case. Then the extents of sen? sory and motor block were compared between two groups, and their anesthesia effect and adverse reactions were also record? ed.Results Compared with group A, onset time of sensory block in group B was significantly shorter (P<0.05), while onset time for motor block was of no significant difference；By contrast to group A, acting time of sensory block in group B pro? longed significantly (P<0.05) while acting time of motor block was of no statistically significant difference(P>0.05);By con? trast to group A, the anesthesia effect of group B was more effective while the adverse reactions of the two groups was of no significant difference (P>0.05). Conclusion 0.75% hyperbaric ropivacaine in lumbar anesthesia for elderly patients un? dergoing transurethral prostatic resection could provide a better anesthesia and analgesia effect than0.5% hyperbaric ropiva? caine without more significant adverse reactions.