In recent years,beoause of less amount and uneven distribution of precipitation, the agricultural development in Cangzhou prefecture was retricted. Water resource is an important component of agroecosystem. The agriculture can achieve outstanding advance only with adequate water.In this paper, in accordance with the characteristics of climate and based on the rules of Four-watet transformation and use of water by crops,a set of ecological water conservancy engineering systems were established, which fit eco...