The characterization construction of computer crime investigation speciality after enrollment reform of police colleges and universities is characterized by emphasizes on practical and realistic,sustainable development efforts.

In criminal investigation it is also an efficient method to help investigators analyze and recognize cases.

Japanese law system became a branch of Chinese law system after having learnt the political system from China in Tang Dynasty,which is known as Dahua Reform,and thus its criminal investigation system can be defined as Tang Form.

The utilization of polygraph technology in criminal investigation complies with the requirement of investigating science.

Design and Realization of the Forensics Search System of Computer Crimes;

On the Person Who are Relatively Responsible for Crimes Should not be the Subject of the Computer Crime;

After a dozen of year s development,computer forensic technology,as a special one,has become one of the most important ways in which public security departments find and gather evidence,and it has been used extensively to solve computer crimes and accidents.

There exist security problems due to the openness of computer system and the weakness of computer itself, which leads to many computer crimes.

While meeting the arrival of informational society, people find computer crimes have been increased sharply, which not only bring great economic damage to the victims but destroy the economic order of the society and threaten every country s national security and social cultures.