With the water tourism developed, making the development of water landscape rising rapidly. How to ensure the safety of hydraulic engineering technology under normal circumstances, and protect the ecological environment, play tourism economic benefits are an important problem in landscape design. Under the premise of following the principle of water conservancy landscape planning and design, applying AHP to research Xiya ditch waterfall landscape and optimize design program, then set up the preferred plan from ecological effect, waterfalls and technological factors three aspects of evaluation index. This provides theory basis for model test and engineering implementation in Xiya ditch waterfall landscape. In recent years, water conservancy projects relying on water industry form a large number of humanities landscape, natural landscape. The development of water tourism, gradually achieved a certain economic, social and environmental benefits. Giving full play to the comprehensive benefits of water conservancy projects, Ministry of Water Resources has granted water tourism as three major elements in water economy with water supply, power generation.