Conclusions: For unilateral spinal anaesthesia in the ureteral cobble, kidney calculus operations, 7mg 0.5% hyperbaric bupivacaine solution for taking out the ureteral cobble and 9mg 0.5% hyperbaric bupivacaine solution for taking out the kidney calculus and keeping the patinets for 10 min in the lateral decubitus position were found to be appropriate.