Abstract: In this experiment, using Kexin 1 as the material,the effects of different irrigation treatment on the physiological characteristics of potato were studied. The results showed that no irrigation at seedling stage, the activity of SOD, POD was high and the contents of free proline and soluble protein was also high, which can enhance the drought resistance of plants.With the irrigation at tuber formation,expanding stage, the activity of SOD,POD were increased, the content of soluble protein were increased and the increment of MDA and free proline decreased, which can promote the growth of potato.Irrigation at mature stage had no significant effect on physiological characteristics.