Therefore the suppression and prevention of youngsters sexual crime must start from problems at its source,it is necessary to set up schools,families,society three-dimensional defense system and start youth self-immunization.

The research was to identify the differences of personality traits, the secondary personality factor and practical personality factor between young criminals and young students by Cattell s Sixteen Personality Factor Test .

Today, the total number of female crime is increasing very fast, and the rate of female crime is becoming high.

In order to provide psychological basis for the criminal forecast and correction,we must understand the personality of the male criminals in Tianshui prison who are kept in bonds.