本文分析我院司法精神医学鉴定中４８例性被害者的案例资料，发现性被害者中以精神发育迟滞居首位（３９例，８１．３％），次为精神分裂症和躁狂症。被告大多数为相识者。性被害者对受奸淫的态度以半被动型为主。性自卫能力的评定，就精神发育迟滞而言，不能过多地依赖智商值，应根据临床智能低下的程度、社会适应能力情况、对性行为后果的认识和态度，以及自我控制和自我保护能力等多方面因素，全面分析，综合评定。 This article analyzes the case data of 48 cases of victims in judicial psychiatry in our hospital. Among the victims of sexual psychosis, 39 cases (81.3%) were mental retardation, followed by schizophrenia and mania. Most defendants are acquaintances. The sexual victim’s attitude toward adultery is mainly semi-passive. The assessment of sexual self-defense ability, in terms of mental retardation, can not rely too much on the IQ value should be based on the degree of clinical intelligence, social adaptability, awareness of the consequences of sexual behavior and attitudes, as well as self-control and self-protection And many other factors, a comprehensive analysis, a comprehensive assessment.