In line with different understandings of the investigative power of the supervisory committee, the academic circles divide the use of this power into three different modes: that of the inquiry power, that of the investigative and inquiry, and that of the investigation. Compared with the other two modes, the investigation power mode is more reasonable. In the practice of the reform of the state supervision system, the third mode is preferred by the supervisory committee. Of course, this mode itself should be further optimized.