1. The concept of voyeurism. Voyeurism is a sexual perversion that corresponds to the expression of exhibitionism. The patient’s main performance is to peep at the sexual activities of others, the naked body of the opposite sex or the vulva of the opposite sex, so as to obtain the highest sexual excitement and sexual satisfaction. Voyeurism is a recurrent or persistent way of spying on other people’s sexual activities or pro-vaginal acts such as undressing as a preference for one’s own sexual arousal. Its prevalence is not known, and such individuals are generally male, with a predominance of 20-40 years of age. As with other sexual perversions, the patient is indifferent to normal sexual intercourse between the sexes. Voyeurism is mainly seen in males, and patients may also engage in exhibitionist or fetishistic behavior. It is essentially a childlike sexual behavior, and its onset is a continuation of these infantile sexual behaviors or a reoccurrence when frustration is experienced. Juvenile sexual urges are its internal driving force. 2. Etiology of voyeurism. The etiology of this disease has not been fully elucidated. It is not uncommon for young people to peek at the nakedness of the opposite sex or spy on the sexual behavior of others as a matter of curiosity, but this behavior can often be replaced by their own sexual experiences, so it is not this disorder. Psychoanalysis suggests that voyeurs often feel shy and awkward with women, hence the voyeurism, or that normal sexual behavior encounters obstacles, hence the behavior. The behavioral school, on the other hand, believes that it is conditioned reinforcement resulting from the sexual arousal obtained from casual voyeurism. The psychopathological nature and pathogenesis of voyeurism and exhibitionism are the same, and are two aspects of infantile sexual behavior, that is, the continuation and reproduction of the desire and action to see or be seen in the sexual games of young male and female partners in adults. 3, the clinical manifestations of voyeurism. Patients try to peek at women’s toilets, baths and sex life, for this reason, and risk sneaking into women’s toilets, women’s bathing room or other people’s bedrooms. Even in public toilets with reflectors, into the cesspool, or on the roof beam, balcony window peeping, they peep at women in the bathroom undress or naked when the scene, peeping when the sexual pleasure, but no sexual behavior imposed on them, some alone on the spot masturbation or afterwards through the memory of imagination and masturbation, to achieve sexual satisfaction. The peeping women may be unaware of this, and their behavior is often discovered by passersby and turned over to the public security department. Our patients, both during psychotherapy and after they have been cured, have admitted that at the time of the voyeuristic action, they did believe deep down that the women were willing to see their penises and to accept his behavior. 4, the diagnosis of voyeurism voyeurism diagnostic criteria. Repeatedly peering at the lower body of the opposite sex, naked, or other sexual activities to meet the strong desire to cause sexual excitement, can masturbate on the spot or afterwards to recall the sight of peeping and masturbation to obtain sexual satisfaction. Almost exclusively seen in men. Watching obscene audiovisual products and gaining sexual satisfaction is not part of this diagnosis. The diagnostic criteria: (1) repeatedly peering at the lower body, naked body of the opposite sex, or other sexual activities, accompanied by sexual excitement or masturbation; (2) no intention to expose themselves; (3) no desire to have sexual relations with the person being peered at. 5, the treatment and prognosis of voyeurism. There are reports of psychoanalysis and group therapy, aversion therapy and other treatment of voyeurism, but there are no positive conclusions. Little is known about the prognosis of this disorder, there have been reports of those who have not recidivated after re-education through labor, but also those who have relapsed again and again until old age.