| Shiyang River Basin is an inland river basin in arid areas,the water resources can not satisfy the water demand.To obtain sustainable water utilization,analyzing the change of water utilization structure and finding out the factors are important.Based on the data from the Communiques of Water Resources in Gansu Province(1991～2004),Information Entropy is used to describe the process of water utilization structure changing.The Method of Factor Analysis is used to find out the driving forces of water utilization structure,which leads this variety happening.The results indicate that the agricultural water utilization is the majority,while other sectors' water utilization is in small proportion; With the structure of water utilization changing faintly,the percentage of agricultural water utilization has been decreasing since 1991,at the same time,that of industrial water utilization and domestic water utilization has been increasing.Information Entropy of water utilization structure shows that Jinchang has a bright future,and water utilization structure in this region is in equilibrium;but Wuwei and the total basin are not.Therefore,continuous efforts should be made to adjust the water utilization structure in the Shiyang River basin,through controlling irrigation areas,closing wells and promoting water-saving technologies to reduce the quantity of agricultural water use,and developing highly efficient water-saving agriculture. |