In order toexplorethe effects of different water suppliedon the root vigor of winter wheat, four standards of irrigation depths which are the ground irrigation, and 60%,75%, and 90%ofthe root depth were studied, measuring the different layers soil moisture content and the root vigor of winter wheat during thewhole stage.The results show that: for the deeper irrigation methods, the surface irrigation amount decreasedandthe deeper layers increased withtheincreasingof irrigation depth.The superficial root vigor of the ground irrigation was almost the biggest andthe value of that of 90%treatment was the minimum. At thelaterstage,the deeper root vigor of the 65%, 75% and 90% irrigation treatmentswould exceed the ground irrigation and even exceed the surface layer root vigor, and deep irrigation treatments delayed the senescence of the root. But too deeper irrigation depth would have effecton the vigor of root in surface soil layer. So it should select the appropriate irrigation depth. In this experiment, the irrigation depth decided on the basis of60% and 75% of root depth could improve the overall root vigor of winter wheat.