Somatosensory evoked potentials are operated by connecting an electrode device and electrically stimulating peripheral nerves to elicit a cortical response, with potentials recorded at different parts of the somatosensory upstream pathway. Somatosensory evoked potential monitoring needs to be performed laterally, and the stimulation sites are determined according to the requirements of the procedure. The anode of the upper extremity stimulation electrode is placed at the transverse carpal tunnel, and the cathode is placed 2-3 cm from the transverse carpal tunnel to stimulate the median or ulnar nerve. Sensory stimulation of the lower limbs is usually chosen for the posterior tibial nerve, with the anode of the stimulating electrode placed 2~3 cm distal to the inner ankle where the posterior tibial nerve travels, and the cathode placed near the ankle between the inner ankle and the Achilles tendon, and the peroneal nerve or sciatic nerve can also be chosen. Somatosensory evoked potentials are mainly used in the diagnosis and objective evaluation of various sensory nerve damages and need to be operated by specialized physicians.