The aim of this study is to compare the level of sensory blockage in spinal anesthesia with bupivacaine %0.5 and lidocaine %5 in surgical patients. Study is a double blind randomized clinical trial. Patients who are candidates for spinal anesthesia and over 16 years old, estimated maximum operation duration until 90 minutes, body mass index(BMI) less than 30 Kg/m2, no history of aspirin and anticoagulant drugs administration at 7 days prior to surgical operation, without columnar deformity, no history of surgical operation on lumbar area, no abscess or infection on the insertion area of spinal needle, no lumbar disc herniation, no history of allergy to bupivacaine and lidocaine, migraine and chronic headache referring to operation room will select for study. pregnant patient, obesity patient with BMI more than 30kg/m2, patient with other than supine position, patient receiving hypnotic and opium drugs will exclude from study. Study population include all patient candidated for spinal anesthesia. sample size is 300 cases:will divide in two groups and each group include 150 cases. quincke spinal needle no 25 insert to L3-L4 interspinous space at sitting position. Lidocaine %5-100mg and bupivacaine %0.5- 15mg will inject in subarachnoid space then patients lie at supine position. intervention time will be 8 months. Pin prick test assessment is done for determination of sensory block level every 5 minutes by needle no 23