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Drought resistance force is an index of plants.It mainly refers to the potential to survive and provide certain economic production with very dry conditions including soil and atmosphere.Drought resistance of plants is a complicated biochemical process on physiology.During the long process of plants evolution,they come to form certain variety of characteristics and mechanism of drought resistance unconsciously.Physiological responses vary from different plants and economical conditions.In this paper,we are going to investigate the physiological responses of citrus toward the threat of drought.