There is no absolute boundary between mental normality and abnormality, but a vague concept, unlike exams, which stipulate that a score of 60 or more is normal and a score of 60 or less is abnormal, but the boundary is between 55-65. Different societies, different cultural environments and different historical periods are not quite consistent in their understanding and evaluation criteria of normal and abnormal. So how exactly can we judge whether a person’s spirit is normal or not? 1. The unity of the individual and the environment. Whether the words and actions of an individual can be accepted by the society and culture in which he or she lives, and whether he or she can be understood by ordinary people. It is common for people to wear a bathing suit in a swimming pool or at the beach, but if they wear a bathing suit to a shopping mall, it seems incongruous with the environment and is usually considered abnormal. However, it is also understandable in specific environments, such as people in seaside resorts such as Beidaihe can often see some people wearing bathing suits to store, and do not feel abnormal. 2, the consistency and integrity of the coordination of mental activities themselves. Whether there is an inherent connection between various mental activity processes such as thinking, emotion, and behavior. If a happy expression is shown while thinking of a happy thing, it means that there is coherence between thinking and emotion. 3, the relative stability of character. As the familiar saying goes, “mountains are easy to change, nature is hard to change”, and it is difficult to change one’s personality during one’s life. An introverted person who talks a lot in a period of time, happy, busy all day, the psychiatrist may have to suspect that he has “mania”. This suggests that we should observe whether a person’s behavior is abnormal by longitudinal comparison. From another point of view, a certain phenomenon, there is no absolute normal and abnormal, if the above-mentioned situation appears in a person who used to be cheerful and lively, he is normal. However, it is understandable that some people have a certain degree of change in their personality after suffering a major stimulus. 4, whether their behavior is consistent with the majority of people in the same situation. For example, a two-year-old boy said to his mother: I have to pee, squatting on the floor and peeing, people do not think anything. If a 20-year-old does this, then we would think he has a mental problem. This is to say that the standard of behavior is different at different ages; a person’s behavior is also related to the background of the times, a young woman wearing a halter top, shorts, slippers walking in the street, you do not think anything (because many people are like this), such dress if put in the Cultural Revolution, you do not think she is sick to be strange.