The efficient precipitation,the water demand and the deficiencies of main crops in different typical years and in different growth period in Baoding plain have been studied in detail.

• 得出了保定市农业用水量从90年代中后期大幅度增加而有效降雨量的明显减小，是造成保定市水资源供需矛盾突出的主要原因之一。