In recent years, with the continuous development of the electric power industry in China, the per capita electricity consumption is increasing, and the scale of the power grid is also expanding. In order to ensure the power supply and continuity, a complete power supply system and power dispatching(PD) system must be established. At the same time, the key information privacy protection technology(PPT) of PD has also become the focus of the current power sector. Based on sensitive data(SD), this paper studies and analyzes the PPT of key information in PD. This paper discusses the key issues of SD security management and anti disclosure technology, as well as the advantages of SD security management and anti disclosure system model. The overall design of PD system is analyzed, and the PPT of key information of PD is studied based on SD. Finally, the effectiveness of PPT in this paper is verified through the evolution trend analysis of privacy leakage degree with the number of releases.