| Heilonggang District is located in the eastern part of Hebei Lowland Plain, where is the driest area in North China region, and because of water resources great shortage, drought index is more than2.0. Although the soil texture is barren with high degree of salinization, poor fertility and conservation, Heilonggang district is an important agro-ecological region with production of food and cotton in Hebei Province. So the agricultural planting structure is wheat-corn-cotton; therefore, agricultural water demand is very large, which is more than70percent of the account for regional total water demand. Because of mainly dependent on groundwater resources for irrigation, supply and demand contradiction of water resources is very prominent; groundwater resources were over pumping and have been destroyed. Therefore, it is important to carry out comprehensive quality assessment of water-land resources and study on coupling-coordination for clarify the mechanism of action between the various elements of regional water, land resources and economics system; at the same time, the development and evolution type of regional water-land resources and economic system should be identified, which is particularly important to resolve the contradiction between supply and demand of regional water-land resources, and to ensure coordinated development of regional resources and economics.In this paper, in-depth analysis of the type, distribution and utilization of water-land resources was carried out, and using Arcgis10platform, based on entropy right method and coupling-coordination theory, quality assessment of regional water-land resources and balance between supply and demand for water resources also were studied. Meanwhile, small-scale coupling-coordination evaluation of regional water, land resources and economic system was done to divide the development and evolution type of regional water-land resources and economic system. Finally, some experiments of water resources utilizing technology in typical land type area were carried out.(1) The comprehensive quality of water-land resources is very unevenly distributed with low values in Heilonggang District, which values are mostly in the0.4-0.6. The situation of regional water resource shortages and land resource-poor is very common, especially in Huanghua City, Cangxian County, Jingxian County and Raoyang County, where the regional water and land resources quality value of approximately4536km2areas is less than0.4, belonging to the worst areas of land and water resources. On the other hand, some relatively good area which evaluation value is more than0.6only is scattered in southern Heilonggang District, such as Linzhang County, Quzhou County and Longyao County, corering and area of less than860km2, accounted for only2.5%of the overall area.(2) The results of supply and demand balance analysis on water-land resources under agricultural planting structure show that groundwater resources supply and demand shortage is the most prominent in north of Heilonggang District, and it is about8150km2area that the regional water-land resources supply and demand coefficient is less than0.2, belonging to the water-land resources supply and demand serious imbalance area, where water consumption amount of crops is large under agricultural planting structure of winter wheat-summer maize-fruits and vegetables. However, in south of Heilonggang District, such as Guangzong County, Nangong City, Weixian County and Qiuxian County, the regional water-land resources supply and demand coefficient is more than1.0, where water resources are sufficient and the water-land resources supply and demand is balance under agricultural planting structure of cotton-oil crop.(3) Under status quo conditions, the degree of coupling between the three subsystems as water resource, land resources and socio-economics, which is within the regional water-land resources and economic system, is high, but the coupling-coordination degree is relatively low. And the system co-ordination is mainly concentrated in the primary coordination type and intermediate type of coordinated development. And then, there is almost no highly coordination development area where the coupling-coordination degree is more than0.8. Furthermore, there are some areas scattered in Jingxian County, Raoyang County, Cangxian County and Huanghua City, which belong to mild coordinated development type and brink of disorders recession type with less than0.6of the coupling-coordination.(4) In Heilonggang District, it is uncoordinated state of regional water resource conditions, land use patterns and socio-economic development modes. And most of water resources development lags behind socio-economic development and land use. About51.4%of the areas are severely damaged-extremely damaged economic development model for water resource, and about57.1%of the areas are severely damaged-extremely damaged land use patterns for water resource. But it is relatively balanced between regional land use and socio-economic development, and most of areas belong to the moderate land use-equilibrium mode for economic development.(5) Based on these results about regional comprehensive quality assessment of water-land resources, supply and demand balance analysis on water-land resources and coupling coordination assessment of water-land resources and economic system, it is very important for regional water-land resources and economics system coordinated and sustainable development that appropriately adjusting the regional agricultural planting structure and researching technologies of water resources use for some typical land resources. These research results also show that using the entropy right method and coupling-coordination theory for studying regional water-land resources and economic system is feasible; furthermore, the comprehensive quality assessment model of water-land resources and coupling coordination model of water-land resources and economic system based on above theories truly reflect the status and could provide theoretical support for the regional resources and economic sustainable development.(6) In order to promote coordinated development of regional resources and economic, it is necessary for adjusting the regional agricultural planting structure to adapt to the conditions of water resources. Therefore, under the premise of ensuring food security, the winter wheat and vegetable growing area should be reduced in water resources severely damaged and extremely damaged district, and some low consumption water crops, such as cotton, millet, oil and potato, should be increased acreage. However, in those districts with adequate water supply and slow economic growth, it is necessary to reduce the growing area of cotton and oil crop and increase acreage of high water consumption and high economic efficiency crops such as winter wheat, vegetable and fruits. And in the eastern coastal saline land distribution district with poor quality of land and water resources, it is suitable for growing some salinity crops, such as cotton, jujube, alfalfa, sea fennel and seaside cabbage, or developing aquaculture.(7) In the sandy soil distribution district, promoting to agricultural water resources using technology of bury drip irrigation can effectively prevent the problems of water and fertilizer leakage and evaporation between strains for conserving water resources. Meanwhile, in some plain area with concentrated rainfall, good soil infiltration capacity, thickness confining layer under cultivated horizon and without afflux plane, it can achieve infiltration collection and reuse of rainwater resources that research rainwater collect-store technology and promote to the buried rainwater collect-store facilities.
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