First, what is biofeedback therapy biofeedback therapy is the application of biofeedback principle in clinical work, is one of the many methods of psychotherapy. Biofeedback is the use of instruments to the psychological, physiological activities related to the process of in vivo information (such as electromyographic activity, skin temperature, heart rate, blood pressure, brain waves, etc.) to be processed to visual or auditory display in people (i.e., information feedback), training people through the awareness of this information, learn to consciously control their own psychophysiological activities, in order to achieve the purpose of adjusting the body’s functions, disease prevention and treatment. In short, biofeedback is the use of instruments to understand the information process related to their own physiology and psychology, and learn to control and change these processes at will. Second, biofeedback therapy for people biofeedback therapy is applicable to the medical field, such as the treatment of pediatric ADHD, learning difficulties, childhood mood disorders, etc., psychiatric depression, anxiety, insomnia, neurosis, stress disorders, obsessive-compulsive disorder, etc., neurology epilepsy, pain, cerebrovascular disease, etc., internal medicine hypertension, heart disease, diabetes, rheumatism, hyperthyroidism and other psychosomatic diseases, rehabilitation department of urinary and fecal incontinence, paralysis, disability, etc.; also applicable to the field of education, such as in school counseling centers to deal with examination stress, emotional disorders, Internet addiction, social disorders, suicidal tendencies, etc., or in university psychology departments for teaching demonstration (demonstration of various types of physiological signals), scientific research (collection of different physiological signals to provide effective tools to the subject), etc.; also applicable to the field of sports, such as assisting athletes in activation level regulation, mental quality training, attention maintenance training, etc. In addition, there are also applications in special fields such as police, military, pilots, prison personnel and other high stress people’s physical and mental health maintenance. Third, the operation technology of biofeedback therapy 1, electroencephalography (EEG) feedback varies according to the brain waves (1) δ wave (0.5-4HZ): just born background rhythm to δ wave, normal adults only in the sleep state will appear δ wave, such as in the waking state, the discharge site may have lesions, such as epilepsy, traumatic brain injury, etc.; (2) theta wave (4-8HZ): with the person’s sleep and creative (2) theta wave (4-8HZ): it is related to sleep and creative thinking of people. By enhancing training of theta wave and increasing the ratio of theta wave in EEG, it can treat insomnia and sleep disorders, neurasthenia, etc.; (3) alpha wave (8-13HZ): it is most obvious in the parietal and occipital areas of the head, and is related to deep thinking of people. When a person is thinking deeply about a problem, the body is in a highly relaxed state. Therefore, in anxiety treatment, we can do alpha wave enhancement training to increase the proportion of alpha wave in EEG, which can improve anxiety symptoms; (4) SMR rhythm (12-15HZ): it is related to the self-control and regulation ability of muscle body, and for children with ADHD, we can do SMR rhythm enhancement training to improve hyperactivity symptoms; (5) beta wave (16-30HZ): it is related to people’s attention and anxiety. When the EEG is dominated by beta waves, people will only be in two states: non-fight or flight. Doing beta wave enhancement training can improve the individual’s level of alertness and improve attention deficit problems. 2, electromyography (EMG) feedback: is a more common biofeedback technology. The degree of muscle tension is positively correlated with the degree of emotion, and the skeletal muscle in the forehead is the most representative. Used for the treatment of various tension, insomnia, anxiety states, as well as certain psychosomatic diseases, but also for the rehabilitation of paralyzed patients. For anxiety, tension, insomnia are generally done to inhibit the relaxation training of myoelectricity, while for the rehabilitation of paralyzed patients, the enhancement training of myoelectricity is done so that the patient gradually regains consciousness; 3, skin temperature (TEMP) feedback: the contraction and diastole of peripheral blood vessels determine the change of skin temperature. The change of skin temperature at the fingertip (ventral side of the little finger) is recorded with a thermosensitive varicose resistive thermometer and converted into acoustic, optical and digital signals to feedback to the patient for training so that he or she can learn to control the degree of peripheral vasodilation. It is used to treat neurovascular dysfunction, such as migraine and Raynaud’s disease. Skin temperature can also be considered as an indicator related to relaxation and used for relaxation training; 4. Skin electrical (SC) feedback: When a person is sympathetically excited, sweat gland secretion is enhanced, and the level of electrical conductivity is increased, so the skin electrical response is closely related to emotional excitement. Record the electrical skin response signal, mainly to measure changes in skin surface resistance, and convert it into audio-visual signals for patients to carry out emotional control training. It is mainly used to treat anxiety, phobia, hypertension, asthma, and hyperhidrosis. Relaxation training is mainly done to inhibit skin electricity; 5, blood volume (BVP) and electrocardiography (EKG) feedback: mainly used for patients with primary hypertension, but also for other cardiovascular symptoms, such as arrhythmias; 6, respiratory (RESP) feedback: mainly used for relaxation training, combined with electromyography as an aid, requiring the trainee to do deep, slow and steady breathing, feedback requirements to reduce the respiratory rate and Enhance the breathing amplitude. Fourth, biofeedback treatment considerations before treatment, the therapist and the person being treated should trust each other, eliminate misunderstandings, form a consensus on biofeedback treatment, and establish a good therapeutic relationship. The person being biofeedback should be released from physical and mental restraint, evacuate urine and stool, and properly dispose of belongings. During the treatment, the treated person should relax the body, breathe calmly, concentrate mentally, reduce distractions, and enter into a state of complete physical and mental rest. At the end of the treatment, the therapist will discuss the treatment experience with the participant, affirm the achievement, and encourage him/her to make continuous progress in future training.