In recent years, the phenomenon of drought has led to a sharp decrease in surface waters in the Fasa plain This has led to an increase in the utilization of groundwater resources and an intensification of the landing level of the groundwater table in the plain. The purpose of this study was to investigate the reaction of groundwater of Fasa Plain to the occurrence of droughts and mildew and correlation between them. First, the drought characteristics of meteorological and hydrogeological data were calculated by using the standardized precipitation index (SPI), surface water index (SWI) and groundwater source index (GRI). Then, Pearson correlation and cross correlation between indices for the three data series were calculated on a monthly scale (1, 3, 6, 9, 12, 18, 24) . The results showed that the changes in drought are severe and variable, but the drought condition of the groundwater is more stable and the changes are not high. Regarding the SPI index, during the statistical period, two major droughts occurred at the end of 2006 to the beginning of 2008 and the other at the end of 2008 to the beginning of 2010, at the synoptic station of Fasa plain, which according to the results of GRI and SWI indices , Its effect on the groundwater level of the Fasa plain is visible,So that the GRI and SWI indices show a delayed hydrological drought occurring in the region with droughts in 2007 and 2009The results of the correlation between the indices showed that the highest negative correlation coefficients between the SWI and SPI indicators occur at high temporal scales, so the highest correlation between the SWI and SPI indicators is observed at 18 and 24 months, that is, the effect of rainfall on underground water in long termscales is more than short-term scales The correlation between GRI and SWI is high (above 90% correlation), but the correlation between the SPI index and groundwater indices is low due to the time interval between hydrological drought and drought. Also, the cross-correlation between the indices shows that there is a 1-2 year delay between the meteorological and hydrological droughts. Also, the average electrical conductivity of water during the statistical period has an increasing trend and increased from 1600 micromos per cm in 2003 to about 2000 micromos per cm in 1394. The changes in water level in the Fasa plain during the statistical period have a decreasing trend and the highest amount of water level in the year 2005 and then the water level was decreased continuously, the lowest amount of water level in 1394 was observed at 1304 meters, so that in Over the last ten years, more than 10 meters of water level has been lower.Decreasing water level caused increasing electrical conductivity of water. Also, during the last 6 years (2011-2012), the amount of drainage and drainage of wells in the Fasa Plain has been reduced continuously, so that in 2010 about 50 million cubic meters of water was drained out of wells, however, 1395 to 27 million meters. More precisely, over the last six years, the volume of wells has been halved and the wells have lost their ability to feed themselves, which is the main reason for the overdue manifestations and droughts that have occurred in recent years. Key words: Drought, SPI Index, SWI Index, GRI Index, Fasa Plain