Area changes of plain reservoirs and aquafarms in the Yellow River Delta with remote sensing(RS) data and geographic information system(GIS)are presented in this paper.Results indicate that the areas of reservoirs and aquafarms in the Yellow River Delta are very small in 1976,and they increased very slowly until the year of 1981.From the year of 1986,they increased very quickly.According to the regression analysis between areas and years,areas of plain reservoirs and aquafarms in the Yellow River Delta in the year of 2005 and 2010 will be 352 km~2 and 418 km~2 respectively.These results can help to give decision-makers some evidence for management of the Yellow River Delta.