Nowadays, producing more food with fewer water consumption has been a serious need in regions with water scarcity. One of the stategic managing against this problem is to increase crop water use productivity (CWP), using deficit irrigation and nutrition management. In this research, the effects of deficit irrigation and zinc supplementation on root development of wheat, growing in large pots, were investigated, via a factorial split plot design. The treatments included four levels of irrigation and one level of foliar application of zinc sulfate on four cultivars of wheat (Kavir, Roushan, Chamran Ghods). The Grain yield per plant, root volume, root depth, root total area and CWP was measured. Results showed that the root depth changes of the cultivars in response to deficit irrigation are significant, despite the fact that they are not considerable for irrigation scheduling. Moerover, the root volume has been decreased in lower moisture tension, and in response to different irrigation levels, the cultivars with the less root volume (Kavir and Ghods) produced the more grain yield. On the other hand, the application of foliar zinc was not efficient in reducing the effect of water tension on grain yield. Also, the results showed that crop water use productivity in the cultivars used in this experiment, has been maximized associated with semi-severity deficit irrigation. Based on the CWP, the priority of the cultivars is: Kavir (.60 Kg/m hy; 3 ), Ghods (.52), Roushan (.41), Chamran (0.25). Key Words: deficit irrigation, crop water use productivity, wheat, root, zinc nutrition .