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For optimizing Nong'an branch water supply project��the schemes of east line��west line��east-west combined line and river line are discussed using comparison and selection method and AHP��in which the west line is considered to be the optimal line from the construction condition��operation and management��water supply security and investment cost�� The west line has easy construction condition��convenient operation and management��safe water supply and low investment cost�� Abandoned river lines are also further discussed��