Because investigation is a practical subject, the research of investigation theory must focus on investigation practice. Since the reform and opening up 20 years ago, a large number of academic papers and works have been about investigation measures, methods and countermeasures. The research of these papers and works involves various investigation means, methods and countermeasures. In the research of investigation measures and methods, especially interrogation and on-site investigation. The traditional investigation system has three technologies: criminal technology, action technology and network investigation technology. Today, video detection technology has become the fourth technical support after criminal technology, action technology and network detection technology. The rapid development of video detection technology provides a more efficient and efficient means for case handlers to solve crimes.

In the research of investigation countermeasures, scholars mainly discuss different cases and specific cases, and some scholars put forward investigation countermeasures in combination with the development trend of future crimes, such as intelligence and internationalization. Some scholars have found another way to discuss the management of investigation countermeasures from the perspective of investigation and anti-investigation confrontation, and put forward that investigators should strengthen the prevention, identification and utilization of anti-investigation behavior. So far, a complete video surveillance system can improve the work efficiency of case handlers.

Generally speaking, the theoretical research on investigation measures, methods and countermeasures covers almost all levels of investigation activities and plays an important guiding role in investigation practice.