From the viewpoints of practice of decision in criminal investigation,way of thoughts imposes significant influences upon the scientific features of decision in criminal investigation mainly through three aspects,namely: it determines the recognition attitude of staff in criminal investigation towards the case,it decides the researching metho.

So an assistant support system of investigation decision based on Data Mining(DM) techniques has been put forward in this paper,and the core function of that system has be.

Study on Countermeasures in investigation of Internet Pyramid Selling;

Interpretating the nature of investigative strategy is good for investigative practice as well as the theoretical research.

It is necessary for an in-depth study on the basic theory of the investigative strategy.

The paper gives an analysis of the tricks of time in current crime-committing and puts forward investigation countermeasures.

Grasping its criminal regular patterns and studying the investigation countermeasures are helpful in effectively preventing,suppressing and cracking down series of murder cases.

This article targets at analyzing the means and features of loan fraud and presenting investigation countermeasures.