Based on the meteorological satellite data

there are many research ways in which soil moisture is monitored and arid area is estimated

but their accuracy should be improved. In this paper

based on the temperature range in a day measured near the earth’s surface

the inversion of temperature range in a day from meteorological satellite were rectified

as a result

thermal inertia could be calculated more closely to the fact. Regression analysis of the thermal inertia and soil absolute moisture measured in farmland showed that the moisture in 0-30 cm soil had significant correlation with the thermal inertia

but moisture in deeper soil hadn’t. Supported by GIS platform

the drought in earlysummer of 2004 was monitored more accurately

by which further drought estimation could be carried on.