Ropivacaine and lidocaine are both local anesthetics, of which lidocaine is a medium-acting local anesthetic with fast onset, wide diffusion, strong penetration, and no significant vasodilatation, and toxicity increases with the concentration of the drug. At the same concentration, 2% lidocaine is twice as toxic as procaine. Intravenous injection or intravenous drip lidocaine can treat ventricular arrhythmias and is generally used as oropharyngeal and tracheal surface anesthesia, nerve block and epidural cavity block. Ropivacaine is a long-acting local anesthetic with a large difference in blockade of sensory and motor nerves, providing clinical analgesia and yet reducing blockade of motor nerves. At equal doses of epidural administration, there is no significant difference between the two drugs for sensory nerve block, but ropivacaine has a slow onset, weaker blocking efficacy, and shorter duration for motor nerve block.