The upper limbs (hands) are rich in nerve fibers and receptors, and the hands are sensitive to touch, pressure, temperature, and two-point discrimination. The senses of the hand include superficial sensations (pain, temperature, touch), deep sensations (kinesthesia, vibration and position) and compound sensations (two-point discrimination, shape perception, etc.). The nerves that govern the movement and sensation of the upper extremity (hand) are mainly the brachial plexus nerve and its branches: axillary nerve, musculocutaneous nerve, ulnar nerve, median nerve, radial nerve. After injury to the peripheral nerves of the upper extremity (hand), the original sensory state is not fully restored after repair. The immaturity of the myelin sheath, slowed sensory conduction, or incomplete regrowth or misconnection of nerve axons and misalignment of nerve endings prevent many new axon buds from growing into the original myelin sheath. As a result, abnormal sensations and sensory deficits in certain areas occur, which may also be due to the failure of the cerebral cortex to correctly recognize altered input from regenerating axons or sensory terminals. This requires a re-recognition and discrimination of the brain to respond accordingly to the new stimulus pattern. Alterations in sensory localization and characterization can occur due to abnormal function of a few small nerve fibers and receptors at the distal end of the repair. The goal of our sensory training is to restore the highest possible level of functional sensory and tactile sensation to the patient. Sensory training often requires visual assistance, using various methods of repetitive stimulation of the receptors to establish new information reception and processing in the patient’s brain. The specific process is to provide sensory information to the patient through the visual or memory stimulus perception, paying attention to the nature and degree of the stimulus and the different sensations of different stimuli, and through the training sequence of eyes closed-eyes open-eyes closed, thus carrying out the role of the higher cortical centers of the brain to re-integrate. The sequence of sensory recovery in the hand is pain, warmth, 33Hz vibration, mobility touch, constant touch, 256Hz vibration, and discrimination. After the nerve injury, we can train pain, temperature and other protective sensation and vibration sensation in the early stage, and later we can train mobility and constant tactile sensation, shape sensation, discrimination sensation, and also stimulation and localization sensation training. The training methods are briefly described as follows: 1. Pain, temperature and pressure sensory training is a kind of protective sensory training, which can use needling, hot and cold, and deep pressure. Let the patient to experience the characteristics of each sensation, and then a variety of sensory stimuli, respectively, according to the procedure of eye closure – eye opening – eye closure repeated reinforcement practice. Through training, the patient should re-establish the sensory information processing system. 2, early stimulus discrimination and localization training rehabilitation therapists and trainers (family members) with the finger end of the palm surface (fingertip area) tapping the patient’s palm surface, or the head of a pencil, chopsticks (sharpened and polished) pressed on the palm of the hand to move back and forth, the patient must look at the pressure point, with visual assistance to determine the location of the point, and then let the patient close his eyes, the healthy hand instructions tapping site, then open eyes to confirm, and then close eyes to practice. This is repeated until the patient is able to judge the stimulation site more accurately. Discriminatory sensory training: let the patient identify surfaces with different thicknesses, memory, the beginning should be practiced from different qualities of the material to the small surface with large differences in thickness, repeatedly rubbing the skin to increase the ability to distinguish, gradually transition to distinguish surfaces with small differences in thickness, still in the order of eyes closed – eyes open – eyes closed. The later stage of sensory retraining: the patient can be trained to distinguish objects of different sizes and shapes from large to small, thick to thin, rough to soft and smooth. Daily utensils such as buttons, coins, keys and locks, pins, faucets, large and small dishes, and functional dexterity training can also be used.