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The Hexi Corridor is an important base of agriculture development in Northwest China. According to re-cent statistics, there are 65.94 × 108m3 of water resources available in the Hexi Corridor. At present, net consumption indevelopment and utilization is 43.33 x 108m3. Water supply and demand reach a balance on the recent level of produc-tion, but loss of evaporation and evapotranspiration is as much as 25.69 × 108m3. So net use efficiency of water resourcesis 59%. Based on analyzing balance between water and land considering ecological environment at present, there existsthe serious water shortage in the Shiyang River system where irrigation lands have overloaded. There is a comparative bal-ance between supply and demand of water resource in the Heihe River system; and the Sule River system has some sur-plus water to extend irrigation land. Use of agriculture water accounts for 83.3% and ecological forest and grass for6. 9%. The Hexi Corridor still has a great potential for water saving in agriculture production. Water-saving efficiency ofirrigation is about 10% by using such traditional technologies as furrow and border-dike irrigation and small check irriga-tion, and water-saving with plastic film cover and techniques of advanced sprinkler and drip/micro irrigation etc. cansave more than 60% of irrigated water. Incremental irrigation area for water-saving potential in the Hexi Corridor hasbeen estimated as 56% - 197% to original irrigation area. So the second water sources can be developed from water sav-ing agriculture in the Hexi Corridor under Development of the Western Part of China in large scale. This potential can berealized step by step through developing the water-saving measures, improving the ecological condition of oasis agricul-ture, and optimizing allocation of water resources in three river systems.