Abstract:The threeyearold delayed cultivation of Red Globe grape was used as material. At the later stage of growth, soil water content was controlled at 0.20 (T1), 0.25 (T2) and 0.30 m3·m-3 (T3). The common management methods of fruit growers were used as control (CK). The changes of water transport structure and water consumption of fruits were studied by means of slicing and field stem flow measurements during fruit ripening. The results showed that: (1) at the early stage of grape fruit color change, the xylem structure of the fruit stalk vascular bundle was intact and the pipe wall was clearly visible. In the middle stage of fruit color change, the wall of the xylem part of the fruit stalk become blurred, the cross sectional area of the central vascular bundle of the fruit brush in the middle stage was smaller than that in the early stage. In the later stage, the guide tube wall of fruit brush and fruit stem xylem were blurred and broken. (2) When the soluble solids content of grape fruit was 7%, the epidermal cells of fruit stalk were closely arranged and the intercellular space was small, and the vascular bundle of fruit brush were clearly visible. When the soluble solids content reached 11%, the number of central vascular bundles of fruit brush was larger than that of ovule vascular bundles, and the distribution was different. When soluble solids content increased to 15%, the fruit stalks were visible.Epidermal cells arranged loosely, epidermal cells elongated, some cells ruptured, and the central vascular bundle and ovule vascular bundle of fruit brush collapsed. (3) On September 11, the stem sap flow of different soil moisture treatments(CK, T1, T2 and T3) reached the maximum, with the peak values of 3.51, 3.95, 4.37 and 4.59 d·L-1, respectively. In the middle stage of grape color change, stem sap flow of T1 was significantly lower than that of T2 and T3 (P < 0.05) under the influence of low temperature, but there was no significant difference between T1 and CK. From October 15 to October 26, there was no obvious extreme low temperature, and the sap flow rate of the trees decreased among different treatments. With the continuous decrease of temperature in late November, the sap flow rate of each treatment decreased rapidly. It was found that the excessive soil moisture resulted in the decrease of stem sap flow at low temperature, and the increase of soil water supply could delay the accumulation of soluble solids in grapes, thus delaying the ripening of grapes.