[Objective] The response of soil water content to the change of the flow rate and fine roots of Hippophae rhamnoides in the feldspathic sandstone area was studied in order to provide reference for the rational cultivation and management of H. rhamnoides in the arid and water-deficient area.[Methods] The stem sap flow of H. rhamnoides plantations in Wenshui Township, Zhungeer Banner, Ordos City was monitored by using Granier stem sap flow measurement system for a long time, and the fine roots of plants and the soil moisture around the fine roots were measured at the same time, and the response of stem fluid flow and fine root changes to soil moisture in the growing season (September and October) of the H. rhamnoides plantation were analyzed using correlation analysis.[Results] ① The soil water content and the flow rate of H. rhamnoides were lower in the early period (June to July), increased in the middle and late period (July to September), and decreased rapidly in the late period (September and October). The growth rate of fine roots of seabuckthorn was higher in the middle and late period, and lower in the early and late period. ② The variation trend of soil water content and sea-buckthorn fluid flow rate in each month during the growing season was consistent, and the descending order was as follows:August >July >September > June >October. ③ There was a significant positive correlation between the change of soil water content and the flow rate of sea-buckthorn (p<0.01). With the increase of soil water content, the flow rate of sea-buckthorn gradually increased. The growth rate of fine roots of sea-buckthorn was positively correlated with the flow rate of sea-buckthorn (p<0.05). The faster the growth rate of fine roots of sea-buckthorn was, the higher the flow rate of sea-buckthorn was. On the contrary, the slower the growth rate of fine roots of sea-buckthorn was, the lower the flow rate of sea-buckthorn was. There was a significant positive correlation between soil water content and fine root growth rate (p<0.01). With the increase of soil water content, the fine root growth rate of seabuckthorn gradually increased.[Conclusion] The change of H. rhamnoides sap flow is the main factor affecting the change of soil moisture in feldspathic sandstone area, and the change of fine root of H. rhamnoides also affects the change of soil moisture. Relatively speaking, the change of sap flow of H. rhamnoides is greater than that of fine root of H. rhamnoides. Transpiration is the main factor affecting soil moisture in feldspathic sandstone area.