Abstract: Maize growth rate, leaf water potential, osmotic potential, stomatic conductance and water consumption were studied in soil alternate drying wetting. Results showed that when maize plant was exposed in slow drying and recovering to supply water, leaf osmotic regulation capacity can be increased, leaf water potential of growth rate declined was decreased. Stomatic conductance is sensitive to soil water and has after effect in course of drying wetting. Leaf transpiration is decreased with drying wetting cycles increasing. It is concluded that the controlled irrigation time forms drying wetting cycle in such a way as to increase osmotic regulation capacity and compensation for higher yield & higher efficiency of irrigation.