This paper deals with a study on the water characteristics and water regime of red soil derived from Quaternary red clay mixed with the weathering material of Tertiary sand stone in an orange orchard of Jiangxi Province. Results showed that the available water content of the soil was higher due to lower clay content in the soil layer as compared with that of the surrounding typical clayey red soil. The water regime of red soil in orange orchard reflected that water content of 0-100cm layer of the soil was usually lower than the range of available water content even in the first half of a year. It might be related with large consumption of soil water by the growth of orange trees and the high bulk density of subsoil of the soil. However, the water storage beneath 100cm soil layer was still richer either in the first half of a year or in the second half one. Results also showed that the value of W_f.c in 0-100cm layer of the red soil in orange orchard was lower than 1 throughout a year, which meant that a higher amount of empty waterstoring capacity layer where can accept continuously the rainfall could be found. Moreover the W_f.c beneath 100cm of that soil was more than 1,reflecting a richer water storage at the soil layer of beneath 100cm in the second half of a year with severe shortage of rainfall. Consequently, to increase the acceptance of rainfall in the first half of a year and to use the richer water storage in deep soil layers in the second half of a year are of important significance for alleviating the draught in summer and autumn and raising the use efficiency of water resource in red soils.