Local anesthesia is a method of applying anesthetic drugs to local tissues so that sensory nerve conduction is temporarily blocked. Local anesthesia mainly includes surface anesthesia, intravenous anesthesia, nerve stem block and intravertebral anesthesia: surface anesthesia means that local anesthetic drugs with strong permeability are dropped on the surface and gradually absorbed by the organism; infiltration anesthesia is mainly used for minor surgery, where local anesthetic drugs are injected around or at the bottom of the surgical site to achieve pain relief; nerve stem block is mainly used for surgery on targeted sites; Intralesional anesthesia is more effective.