This is a study targeted mainly at the analysis of the soil in ancient watercourses. The soil profile has been studied and
the depth of groundwater measured in sample groups. The result shows a variety of change in the sand-clay layers of the area under test. A wide variety of clay layers ranging from 5 to 20 cm have been found in most of the sample sites within the depth of 1 to 2 m. A gradual annual decrease of soil moisture is observed below the 2-meter depth. An additional study has also been done in the soil of a pear orchard of 7-year growth for the dynamic regularity of the change in soil moisture and a test of effective water reserve in the regolith has been done within the 2-meter depth. The result shows a striking seasonal variation in the soil moisture of the regolith ranging from 0 to 80 cm within the growth period. An irregular insufficient water supply in the soil has also been observed at the site but the variation of soil moisture remains constant below the 80 cm regolith.