Abstract: It is significant for rational and high effective utilization of agricultural water resources and the upgrade of agricultural production capacity. Based on the key factors that influence demand and supply of regional irrigation water resources, the model that is used to calculate the guarantee degree of regional irrigation water resources was developed. And then this model was applied to the area of Northeast China. The result showed that the state of demand and supply of regional irrigation water resources in Northeast China was in equilibrium on the whole and its value of P equaled to 95%. But the supply of irrigation water resources in Northeast China has been on the verge of deficiency. At the same time, a distinct spatial difference of the guarantee degrees of irrigation water resources in Northeast China was found by means of model and map analysis.