The variation characteristics of soil moisture of jujube and apple trees, soil water availability, dried soil layer and the influence of dried layer to the soil reservoir, and water cycle and balance in the depths of 0-4.0 m at Sunjiayuan in Yanchuan County, Shaanxi Province were analyzed. The results showed that the average soil moisture of jujube tree was 10.6% in the depths of 0-4.0 m and there is about 4.5% available water. The average soil moisture of apple land was 7.4% in the depths of 0-4.0 m which indicates available water was exhausted nearly. Soil moisture of apple tree land presented layered change of "high-low-high" from up to down, and jujube forest vertical change in soil moisture profile was not obvious. Soil water of the jujube and apple trees land was almost difficult available water, but soil water of the jujube trees land is near middle available water. Absorbing soil water was inhibited to some extent for apple trees, but almost no effect on jujube trees. Jujube tree land had only developed mild dried soil layer in the 2.0-4.0 m soil layer, and apple trees land had developed mild, moderate and severe dried soil layer. The bond between deep soil water and the surface of apple and jujube tree land was cut off by dried soil layer. Water cycle was mainly surface water cycle, and underground water circulation did not exist nearly. Soil-plant-atmosphere water cycle model was formed and it belonged to abnormal water cycle type. Dried soil layer developing toward the steady speed would lead to underground water level continuous depression and underground water resource decreased. Soil water in the region was more suitable for developing jujube trees.