| Longkou City, which is located in coastal economic developed area, the demand of water resources is becoming increasingly prominent, facing the requirements of social and economic sustainable development. Balance relationship among water resources, socio-economic development and eco-environment was analyzed in order to reveal the trend of water resources exploitation in Longkou city. Based on searching a large number of relevant domestic and foreign literature, collecting a lot of data on Longkou city's geography, climate, vegetation, land use, regional economic and social development, etc., through a series of data analysis, field experiments and theoretical calculations, micro and macro analysis, the changes of water use and demand were forecasted, and optimal use of agricultural water resources of Longkou city was studied.(1) Based on the water demand analysis of industry, agriculture, life and eco-environment for Longkou city, rational allocation of water resources was studied accroding to the actual situation of water supply and the requirements of region sustainable development, taking into account the regional water supply capacity in different hydrological frequency. Namely the environmental water use of domestic and ecology were 21.79 million m3, industrial water consumption was 49.71 million m3, the available water supply of agriculture was 104.23 million m3 in the 50% of the years. And the environmental water use of domestic and ecological were 21.32 million m3, industrial water consumption was 44.74 million m3, the available water supply of agriculture was 80.87 million m3 in the 50% of the years. And the environmental water use of domestic and ecological were 18.50 million m3, industrial water consumption was 34.85 million m3, the available water supply of agriculture was 64.38 million m3 in the 50% of the years.(2) Theory of large scale system was used to research optimal allocation of agriculture water resources in Longkou, taking regional economic optimum as objective function model. Dynamic programming and linear programming method were used to solve the model, to determine the optimal cropping patterns and water distribution process, and finally to achieve optimal allocation of agriculture water resources in different types of typical years.(3) The existing problems of small and dispersible irrigation water resources used for agriculture irrigation were analyzed. As developed area, modern agricultural water use pattern in Longkou city was established based on multi-irrigation water resources net being available, which can achieve the rational allocation and efficient utilization of limited water resources, and maximize the economic, social, and environmental benefits.(4) Based on the field experiment in the study area, water-saving irrigation system which is suitable for the main crops (wheat, grapes) in high efficiency water use projects was analyzed. That is winter-wheat ground border irrigation for three times(winter water, jointing water, heading stage)in the normal river flow year, which irrigation amount was 675 m3/hm2 each time and the irrigation quota was 2025 m3/hm2 in the whole growth period, and the irrigation quota of the grape was 1200 m3/hm2 in the normal river flow year, of which the sap flow period, the new shoot growth period, the young fruit growth period, the branches and tendrils mature period were watered 300 m3/hm2 respectively.(5) In order to solve the existing problems in agricultural water resources management, operation and management mechanism of the modern high efficiency water, calculation of agricultural water price and corresponding management policies were explored, through field investigation, analysis of relevant data at home and abroad.The purpose of the study is to provide new ideas and methods for the utilization and management of water resources, the efficient utilization of agricultural resources in Longkou City. Therefore, the research has important theoretical value and practical application in sustainable economic development of Longkou city.
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