Most parts of the Tibetan Plateau belong to the region frequently attacked by droughts or heavy droughts， which is one of most serious disasters influencing agriculture and pasturing production in Tibet. Using NDVI (Normalized Difference Vegetation Index) and ST (Surface Temperature) gained from MODIS (Moderate Resolution Imaging Spectroradiometer) at the Lhasa receiving station， the STINDVI characteristic space is constructed and a drought discriminating method is devised according to TVDI (TemperatureVegetation Dryness Index) as the drought guideline， along with the satellite datasets for the same periods (June and July) from 2005 to 2008， and the monitoring results of meteorological droughts and soil moisture observation indicate that the TVDI method is applicable in the Tibetan Plateau for monitoring droughts with satellite datasets.