Biofeedback therapy is to take physiological activities that one is not normally aware of and display them through a biofeedback instrument to become signals that one is aware of in order to help self-control these activities. The biofeedback instrument is actually an electronic instrument, which converts physiological changes such as blood pressure, heart rate, pulse, brain waves, skin resistance and body temperature into various quantitative signals that can be felt by the patient himself, such as tones, light dots, numbers, etc., so that the patient, under the guidance of the instrument, tries to regulate and control these functions to the most suitable state, and corrects the uncomfortable reaction to stress, which is beneficial to physical and mental health. The training begins with a biofeedback instrument to teach the patient to learn to fully relax the muscles of the whole body for the purpose of making the patient resistant to anxiety. The patient can be consulted on the choice of body position, and try to make the patient feel comfortable. If, through guidance, the patient can make the signal smaller (i.e., the volume becomes smaller or the marker light proceeds in a negative direction), the physician should promptly encourage and support the patient with a positive tone such as “good” and “right”. However, if the sound is less than ideal, you should not use negative words of guidance, but “don’t rush”, “take your time”, “you’re doing fine” and other guidance. Then teach him to slowly whistle, relax in order of body parts, or analyze the patient’s situation at that time according to the feedback signal, and if he is definitely thinking about something else (which should be mastered carefully), advise him to get rid of the distractions in a concerned tone. Training can be continuous or intermittent. Continuous training is within 20-30 minutes of uninterrupted relaxation training, intermittent training is within the whole 20-30 minutes, can be divided into 4-5 rounds, each round for 4 minutes of training after a 1-minute break. For patients with anxiety disorders, after they learn to relax, they should use more verbal signals to help them consolidate the relaxation effect. Depending on the cause of the anxiety, the appropriate instruction can be incorporated into the relaxation training program. The treatment effect can be judged by the magnitude of the decrease in the basal voltage of EMG and the stability after the decrease, and also by referring to the reduction of clinical symptoms. The effectiveness of the treatment can also be determined by the relapse of the patient’s condition and whether the time interval between relapses is prolonged during the follow-up observation. A large number of clinical practice shows that biofeedback therapy has certain efficacy on anxiety disorders, and can significantly reduce or alleviate patients’ symptoms such as headache, insomnia and palpitation.