Based on the validity classification of soil moisture in the Caijiachuan watershed,using the variogram as a main tool and the ordinary Kriging and indicator Kriging theory,the spatial distribution of soil moisture and validation was conducted through 291 sites soil moisture detection (different depth of soil profile,0~30 cm and 30~60 cm) by TRIME-TDR in research area.The used Kriging could acquire a fine estimation of soil moisture.The result shows that (1) the validation (valid and in-valid) of soil moisture was divided by 13.46% (0~30 cm) and 12.48% (30~60 cm),respectively;(2) The average of the soil moisture in the area is 10.94% (0~30 cm) and 11.88% (30~60 cm),respectively;(3) The area where the soil moisture is in the range of invalid takes about 75.7% (0~30 cm) and 55.7% (30~60 cm) of the whole reserch area,respectively;(4) The validity of soil moisture is in close relation with the slop directions;(5) The probability of soil moisture descends from northeast to southwest in research area;and (6) through the compare the ranger and probability of valid soil moisture in different depth (0~30 cm and 30~60 cm) of soil profile,the result shows that the latter is much more than that in former.