An integrated water quantity and quality evaluation method has been set up for drainage basins,and the integration concepts of water resources functional capacity and water resources functional deficit have been put forward.Based on the monthly data of water quality and water quantity as well as the withdrawals,an integration evaluation of water quantity and quality have been conducted for the Yellow River.The results indicate that the total water resources availabilities were 21.1,28.8 and 29.2 billion m3 occupying about 66.3%,65.6%,and 67.4% of the total runoffs in 1997,1998 andl999,respectively.From 1997 to 1999,the river could provide only 53% (on average)of the total water resources demand for the uses and discharge to the Bohai Sea.About 47% of the water resources deficiency resulted from water pollution,and 53% resulted from water quantity deficiency.Both water resources functional capacity and deficit were large; and the former was little higher than the latter,which suggests that actual water quality was better than the requirement of water resources function in most cases.