The market economy is credit economy,but in recent years,the increasing credit-violation crimes badly affectsh ealthy and rapidly development of Chinese economy,so it has important realistic meaning to study the credit-violation crimes.

The computerization of social information has provided convenience for human beings, meanwhile, people are deeply puzzled by information crime that network has brought about.

The typological study of information crime as a new type of crime has information society as its background of study and the informational characteristics of this type of crime show the inherent difference between highly technological crime and traditional one.

The informationization of society has become a spur to the enormous development of productive forces in human society, and it has also rapidly improved the criminal abilities of lawbreakers, especially in the field of information crime which has broadened the public security territory from real space to imaginary one and severely challenged the public security.

This investigative method renders us easy to obtain criminal information and it is of high value in investigative tactics and investigative moulds.

Criminal information in spots means various evi de nce of traces that suspects leaved at the crime scene and rational cognition gai ned from the change of the objects in the spots by the investigators.