In general, the skin surface potential is parallel to the isotonic muscle tension potential, and the degree of muscle tension is positively correlated with the degree of emotional anxiety, and the skeletal muscle in the forehead is the most representative. Biofeedback therapy is a combination of relaxation therapy and biofeedback techniques developed on the basis of behavioral therapy, and research has shown that most of the EMG values of neurological patients treated with either each treatment or a course of treatment achieved significant decreases, with highly significant differences before and after treatment. Although EMG values decreased after each day of treatment, they still increased the next day, and only through continuous treatment did EMG values gradually decrease to a certain level. It has been reported that myoelectric relaxation level after treatment is less than 1.0 μν feedback efficacy is significant; more easily relaxed forearm muscle, skin surface potential can be reduced to less than 2 μν. This indicates that biofeedback treatment can effectively help patients relax, relieve anxiety, and achieve therapeutic goals. Within the neurosis group, the effect was obvious in the anxiety disorder group, and the corresponding efficacy was obtained in the depressive neurosis group, followed by the obsessive-compulsive disorder group. The EMG values of anxiety disorders and insomnia decreased significantly after treatment. A controlled study between the neurosis group and the schizophrenia group showed that the EMG values in the neurosis group were significantly higher than those in the schizophrenia group before treatment, and there was no significant difference between the two after treatment. The EMG value can be used as one of the indicators to determine the degree of anxiety. The EMG values in the schizophrenia group decreased significantly through treatment. Reports have shown that the schizophrenia biofeedback group showed significant improvement in social functioning and social interest scales, and contributed to the recovery of social functioning in chronic schizophrenia patients. Prior to treatment, patients should exclude all aspects of interference and influence, and should not consume alcohol, coffee, or other stimulating beverages. It should be conducted under the guidance of a guiding language. While experiencing the bodily sensations implied by the guiding language, a fixed and casual acquired behavior is formed through repeated conscious practice, and relaxation becomes a habitual response pattern in life, thus changing the patient’s anxiety and better adapting to the environment. The patient will have impedance during treatment, and there will also be no difference in EMG value before and after treatment. If there is a sudden change in EMG value that predicts anxiety activity, it means that the patient has a certain degree of resistance to treatment, and during treatment, the patient should be allowed to realize that negative emotions such as anxiety, depression, and fear can cause changes in EMG activity through EMG feedback, and gradually learn to control these mental states and achieve cognitive relaxation. Threshold criteria are continuously adjusted with each treatment, requiring the patient to make progress in muscle relaxation (monitored with preset values of EMG indicators). It is important to note that the thresholds are set at just the right level so that the patient can recover as soon as possible. After each exercise, the results obtained are pointed out, homework is presented, and relaxation techniques are applied in life, with the ultimate goal that patients learn to use relaxation techniques to deal with stressful events in daily life even in ordinary times.