The annual irrigation benefit of water diverting from the Huanghe River is 49 1×10 8 kg for grain in the lower reaches of the river. The annual rate of yield increasing for grain is 6 5 per cent in the irrigation regions of water diverting from the river in Shandong Province. The annual amount of yield decreasing is at least 17 21×10 8 kg for grain by the absence of flow in Luokou Lijin reach, the frequency of which is 46 2 per cent. The daily direct economic lose by the absence of flow is 3930×10 4 RMB yuan. Therefore, researching and decreasing the absence of flow in the river, securing and developing the irrigation of water diverting from the river, are keys for the agricultural sustainable development in the area.