Abstract: In the Yellow River old-channel wetland bird national natural reserve of north Henan province, because of being short of water resource and decline of underground water level, the water and the number and kind of bird and beast are reducing quickly and the problem of soil secondary deserfication is being more serious. The research of water requirement of this wetland can be as scientific proof to supply to the ecological restoration project. The research shows that according to the different rainfall year-types, the stable supplying water cab be used to keep the wet effect of land and to recover and protect the wetland entironment.