Abstract: In order to further explore anti-drought ability of seabuckthorn，Caragana korshinskii and oriental arborvitae，two-year-old cutting seedlings of seabuckthorn and two-year-old sowing seedlings of Caragana korshinskii and oriental arborvitae were selected to study photosynthetic and hydropathic indexes of three tree species，drought resistance of three species were further analyzed.Results showed that oriental arborvitae had better drought resistance than that of seabuckthorn and Caragana korshinskii，arborvitae water content，irreducible water and free water ratio and critical saturation loss value of oriental arborvitae were the largest at same period.So oriental arborvitae of three tree species had more drought resistant barren capacity，use of oriental arborvitae should be given priority in afforestation of Huzhu county.