The psychological mechanism for the occurrence of paranoia-like reactions may include the following links: 1, the role of shirking (Projection): When a person walks into a room, where several people talking suddenly stopped talking, so the person feels that the conversation is probably talking about him. This experience is known to all, this is the so-called “shirking role”. 2, self-involvement tendency: anyone has some degree of self-involvement tendency. Because of this characteristic, people can maintain sensitivity to objective things, prompting people to explore the meaning of objective events. Analyze the cause-and-effect relationship between them and decide how to act on their own. Without this characteristic, it would be inconceivable for a person to conduct a normal social life. However, if this self-implicating tendency is overdeveloped, it can also lead to distorted judgments about objective events. For example, the coughing and head scratching of others may be considered relevant to the self, or worse, completely unrelated external scenes may be considered as some kind of signal related to the self. 3.Quality: Paranoid reactions are mostly seen in people with suspicious personalities. Generally speaking, these people are later in age. When they encounter difficulties, they tend to show excessive sensitivity and generate all kinds of suspicion. 4, psychological factors: the psychological factors that cause class paranoia reaction to a certain mental or physical weakness is most common, such as bad habits of masturbation or other sexual inversions: often feel that they have a deficit, and such as illegitimate children or physical disabilities, more sensitive inferiority, these factors often strengthen the role of self-implication and blame, causing a lot of suspicion. Secondly, various setbacks that damage self-esteem, such as failure to promote; frustration in love, love life style, embarrassing criticism and its level of knowledge is not commensurate with the ease of self-pity and sensitivity, and further development can cause class paranoia reaction. 5, chronic deafness: research shows that deafness and paranoia-like reactions have a close relationship, especially in hard of hearing patients, paranoia-like reactions are more common, these patients often have a history of hearing loss for many years, and conductive deafness is more. These patients may suffer from hearing loss as a result of sensory deprivation and then develop a paranoid reaction. However, few studies have been conducted to date and no definitive conclusions have been reached.