This paper describes the principles and methods of monitoring the ionospheric scintillation based on the FY-2 Satellite operational telemetry signals and how the monitor works. The monitor watches realtime satellite signals for scintillation in both amplitude and phase. The telemetry signal from the satellite is one of phase modulation at 1.7 GHz, which is stable in the emission amplitudes and accessible and accurate in the signals loaded. It can be used in the research on ionospheric scintillation in and around China. As the FY-2 Ｓatellite is geostationary and monitors without changes inherent with the motion of the satellite, it is easy to separate the temporal changes from the spatial ones, making it more advantageous than the monitoring with GPS. Designed on the basis of the receivers for broadened cloud imagery that are widely installed across China and with the use of their antenna and channels and high and first intermediate frequencies, the monitoring instrument in question will be readily accepted nationwide and joined in network monitoring. In addition, it will be much more useful due to the availability of signal sources emitting the same frequency in two different directions from the existing networked twin satellites. When combined with the GPSbased dualfrequency scintillation monitors, this monitoring device will also be able to have access to the spectral characteristics of the ionospheric scintillation.