After being divided into knowledge of essential illegality and knowledge of formal illegality,knowledge of illegality should be expended to field of negligent crime and punishment theory to be discussed.

A criminal should be taken as a recidivism if both his/her first offense and second offense belong to the negligent crimes.

His crime transformed into calculated crime and the preceding negligent crime is absorbed.

To determine criminal negligence,it has profound positive significance to abstract and summarize sci-entifically the constitutive elements of criminal nagligence and to make comparative research on it.

Thanks to forms of criminal negligence being displayed by its types,the further study of different types of criminal negligence would be helpful to comprehend criminal negligence thoroughly.

This paper introduces foreign scholar s study on the types of rapists, analyes the particalarity of personality and the characters of the crime commission procession according to the Behavior Science Group of FBI s classification of rapists, and based on this analysis, probes into the investigative countermeasures involved.

In recent years, there are more and more negligence crimes in these fields, especially the offense of vocational negligence.

Therefore, there is rare occurrence of negligence crime.