Abstract: To investigate the equatorial ionospheric scintillation morphology and the relevant physical processes,one GPS ionospheric scintillation monitor was installed at CSSAR Hainan station.The monitor is built on Plessey GPS Builder-2 development system with its software modified to log signal strength from up to 11 channels at a high data rate(50 samples/s).It is suits the high time resolution studies of scintillation spectral and temporal characteristics and also can be used to perform the statistic analysis of scintillation signals.The preliminary analysis results of L-band ionospheric scintillations during Jul.-Dec.2003 show that ionospheric scintillations mainly occur near from sunset to midnight,where the onset and end time are evidently more advanced in Nov.-Dec.than in Jul.-Aug.;the occurrence rate and intensity of ionospheric scintillations are evidently more enhanced in Sept.-Nov.than in other months,and reach their peaks in Oct.;there is the strong randomness for the day-to-day variability of ionospheric scintillations,and the scintillation occurrence reaches their peak during the magnetic quiet days from the end of Sept.to the middle of Oct.near autumnal equinox;the increase of solar and geomagnetic activities generally may limit the occurrence of ionospheric scintillations,especially near autumnal equinox.