| The Shihezi City is located in the south of Jungar basin and the west coast of Manas river. It is the important base of agriculture and industry in Xinjiang. The water supply for city life and industry depends on groundwater resources. With the development of irrigation area in Manas river for 50 years, irrigation water demand increaces continuously, channel inflow decreases, and the recharge of groundwater is decreases continuously.The groundwater exploitation has been increased greatly with the enlarge of city and development of industry since the 1950s. In recent years, with the Shihezi economic-technique development area upgrade to state class, it has rapidly development, such as the electric power, chemical engineering and spinning enterprise and so on. The increase of industry water supply led to more and more environment problems. Base on investigation in 2005, the groundwater has been ovedrafted. Therefore, how to know the evolution pattern of groundwater system, how to assure the principle for mining, how to use groundwater resources sustainably, how to guaranty supply water safely and protect environment , these problems are very important and must be deal with on edge.Not only collect rich data of hydrogeology and groundwater resources, but also do investigation, prospecting and pumping-out test in field, obtaining the latest date of groundwater flow field and chemistry field. Based on the analysis of groundwater system characteristic in Shihezi city, and establishing the flow field of groundwater, hydrogeology model and numerical model, The quantity and quality of groundwater resources were simulated and predicted. using the numerical model and groundwater data for fifty years to comeback nature state of groundwater, to analysis the change laws of groundwater system(including aquifer system, recharge and discharge system, flow system), to predict the variety trend of groundwater system and environmental impact on overdraft exploited, to assure the groundwater exploiting principle and groundwater resources protected plan. This paper systematically summarized the methed for estimating groundwater resources in piedmont of arid area. Some main results and innovation points are following:(1) Divided the groundwater flow system of Shihezi city and established the method to analyze the groundwater system characteristic in the arid area. (2) The total recharge of groundwater is 1.6732×10~8m~3/a, the total discharge groundwater is 2.0341×10~8m~3/a, the result of water budget is -0.3609×10~8m~3/a (3) The change processes of groundwater system show hydraulic head decrease, hydraulic head contours deflect, retreat toward to southeast and be form drawdown funnel in intensive exploitable area. The flow direction deflect a small angle and small scope,and hydraulic gradient diminish. The influence degree to groundwater system for exploiting becomes weak gradually from south to north. (4) Because the groundwater overdraft lead to groundwater water level descends continuously, the safety for water supply of city has been affected. (5)To study the distributive rate of cross-border aquifer, the 59.82% of river recharge flows to shihezi region in Manas river West coast.(6) Use of groundwater numerical model Restored groundwater natural state.(7) Put forward a new principle for groundwater exploitation in the study area, which controls exploitation by the certain rate of descent for realizing unified management and separated exploitation.
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