On the basis of thermal inertia method for the data of NOAA/AVHRR, windspeed is taken into account indirectly for soil moisture estimation through calculating topographic parameters R and F with the aid of EPPL7 GIS. Results show that the accuracy of the estimations becomes higher than without windspeed adjustment. Windspeed can affect soil moisture only at a shallow layer which is less than 30 cm in depth and the best position for soil moisture remote sensing is at about 20 cm or so in depth.