The ecological degradation in the green corridor was mainly caused by continuous river blanking in the lower reaches of Tarim River below the Daxihaizi Reservoir from 1972to 2000. From May of 2000to November of 2011,0times ecological water transition had played an important role in raising groundwater table in the lower reaches. By use of measured data of groundwater during the period of water transition, the paper established water balance equations and made the calculation of water volume below Daxihaizi Reservoir on every water releases. Then, the various water volume transform from river flow were calculated and the level of groundwater restoration were evaluated. Meanwhile, it revealed the hydrological processes that is from channel runoff to recharge & transform and transpiration & dissipation in lower reaches of Tarim River . The results provide scientific basis for the optimum of water release scheme, reasonable allocation of water resources and vegetation restoration.