：Red plum apricot is a deciduous fruit tree and the best cash forest in
semiarid loess hilly regions. Since 1995, the distribution area of red
plum apricot spreads in the most of the water-limited regions, China.
The yield, benefits and plantation area of red plum apricot increase
dramatically. But along with the growth of red plum apricot tree, soil
drying appeared and sometime become sever,which influence the
yield，quality and benefits of red plum apricot. At this time, the
relationship between the soil water and red plum apricot growth must be
regulated on Soil Water Resource Use Limitation by Plant and Soil
Moisture Carrying Capacity for Vegetation. However, there are few
studies on the regulation theory. In this study, daily precipitation,
soil water suctions at different soil water content were measured, and
the maximal infiltration depth and the soil water resource use
limitation by red plum apricot was estimated. The results show that
wilting coefficient varies with soil depth from 7.98 in surface soil to
7.1% in 240 cm soil depth, and the maximal infiltration depth is 290
cm, and Soil Water Resources use limit by red plum apricot is 212.7 mm.
When the soil water resource in the maximal infiltration depth is lower
than the limit, the relationship between the soil water and red plum
apricot vegetative growth must be regulated in Red Plum Apricot
plantation for high quality production of red plum apricot.