Abstract: In ordet to explore the relationship between individual characteristic factor and the male sexual offenders'act, the authors adopted MMPI to test 93 cases of rapist, 20 cases of rapist of underage girls, 51 cases of rascality and 48 cases of larcenist respectively.Having a comparison among offenders of these four types in accordance with their psychological tests, the outcome shows that the scale marks of Pd, Pa, Sc,etc' of rapists and rapists of underage are higher than.normal persons; scale marks of Pa, Sc are also higher than rascals and larcenists' On the MMPI analytical chart they constitute a model 4-8 or 4-6-8, and an additional scale Re appears a low mark obviously.In view of the result of this MMPI test it may explain that the rapists in male sexual offenders possess the characteristics of deficiency in social intercourse, poor judgment, undue sensitivity and act on impulse.

Key words: sexual offense, MMPI, individual characteristics, rapist