As the information of physical evidence was the starting point and central point of the technical investigation,analysis the relationship of physical evidence and the information including of them would be necessary.

Scientific Investigation\'s major appearance is considered as technical investigation.

A Research on the Cognitive Mode of the Technical Investigation;

Judging from the development trend of criminal investigation,technical investigation is an important theory and practical issue of great theoretical and practical meaning which deserves research.

Faced with the new methods of duty crimes which are more and more intelligentized and technicalized, technical investigation is considered as an effective means of investigative techniques.

Also,technological investigation is part of secret investigation,but it isn’t all the meaning of secret investigation.

Because of much dispute over technological investigation in theory and no definite regulation of law,some problems arise in the process of application.

Moreover,secret criminal investigation was differed from compulsory investigation and technique investigation.

As a concept,criminal investigation technology has recently been used to study criminal investigation.

How fully for handled the technical detection methods comes to be the current situation urgent need .