Mental disorder generally refers to the abnormality of the patient’s perception, emotion, thinking and will. However, to judge whether a person has a mental disorder, we should analyze from three aspects: 1. we should make a longitudinal comparison, for example, we should compare with the patient’s past performance to see whether his mental state and past behavior have changed significantly. 2. we should make a horizontal comparison, that is, we should compare with the mental state of most normal people to see whether there is a big difference in time, whether it is beyond a certain limit, and whether the difference is obvious. For example, in people who believe in Christianity, most of them believe that the Lord is in their hearts and they can feel the presence of the Lord all the time. Excitement, can not be said to be abnormal. Therefore, to determine whether there is a mental disorder, should be a comprehensive analysis, to avoid subjective, one-sided.