| This article relies on key water supply project of transferring water from Songhua River to the central cities of Jilin Province that the project can make Jilin province to increase 5 billion kilogram rice. The range of supply water of this project includes Changchun city, Siping city, Liaoyuan city, Jiutai city, Dehui city, Nong'an county, Gongzhuling city, Lishu city, Yitong county, Dongliao county, Shuangyang area and 25 towns near the water supply line.Water supply project of transferring water from Songhua River to the central cities of Jilin Province designs getting water from Fengman reservoir, which is consists of general main line, three main lines of Changchun line, Siping line, Liaoyuan line, thirteen branch lines including Nong'an line, Dehui line etc. The length of supply water general line and main lines is 550km. branch lines length of 285km. Status of the base year adopts 2003, the design level year adopts 2020, Vision year level adopts 2030. The total annua(?) amount of transfer water of design level year(2020) is 0.93 billion cubic meters.Nong'an County is located between the Changchun city and Songyuan city and it has little water resource. The water supply project of Nong'an branch line is the integral part of water supply project of transferring water from Songhua River to the central cities of Jilin Province. The branch line project leads water from Xinlicheng Reservoir to Liangjiazi reservoir of Nong'an County, then from Liangjiazi reservoir to water treatment plant, finally from water treatment plants to Nong'an County.This article bases on large number of Xinlicheng to Nong'an supply water area's social and economic situation,geology,topography, weather and hydrology condition, select solution of the water supply project of Nong'an branch line as optimal study object.with condition of supply water area hydrogeology engineering geology and environment geology, suppose to set supply water engineering arrangement, investment budget, environmental and ecological effects analysis,applies comparison method and AHP to optimize selection of the water supply project of Nong'an branch line. From this article we get such conclusion:1. In the preparation of four alternatives of East line, West line, Combination line and River line, the consistent optimization results are obtained by adopting the ues of comparison and AHP method, that is the West line is the best optimization. This solution is suppose to set intake and pumping station near west of E'touling, Xinlicheng reservoir line goes west to Xiajiawobao then north to Changchun city west highway, and north to along east of Changchun to Nong'an 302 National Road till Liangjiazi reservoir,finally to Nong'an water treatment plants The length of water supply project is 103km, the budget is 374.98 million yuan at present value, and water supply is 44,000 cubic meters a day.2. The paper also preliminarily discusses disposable water supply program of Yitong river and analysts that after dredging and sewage treatment, Yitong adopts the more desirable long-term solution of river water may use river water itself features. Only the investment of program is large, and how to ensure water quality and safety may be more critical.3. During the construction period and engineering operation period, it is shown that the program Optimization has little effect on the ecological of the region of water delivery belt line and will not form in the region of soil salinization and swamping phenomenon by preliminary analysis the environment impact of west line. Construction area makes the damage of the surface vegetation, which can through measures such as tillage layer recovery, to recover in 2-3 years.
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