Abstract: The GPS method is rarely used in the investigation of ionospheric disturbances because of the movement of the observation point which leads to the mixture of both spatial and temporal changes of the observed total electron content(TEC). The present work proposes a new experiment method to modify the effects of the montion of observation points by the observation of a short baseline array of GPS receivers.The experimental results show that the wave parameters of the ionospheric disturbances derived from the observation of a short baseline GPS array are of high precision and reliable. The main advantage of the new experiment method is that the short baseline GPS array may used to observe ionospheric disturbances in a large range.