Abstract: A perfect water quality monitoring system has been built in China during 50 year's effort After many years,we have collected a great deal of water quality data.The China water environment information database was finished in 2001.It includes water quality testing records in 1990s of 160 important water quality stations.The database,maintenance system and in formation system based on Web GIS have made water quality data being shared.In this paper,the prime water quality situation of every big river area are analyzed based on these original data.The probable situation of water environment can be reflected by the statistics,such as water quality class and primary water pollution type.The results show that water environment situation of China is not optimistic,water pollution is serious,and the river area in North China such as Yellow River and Liaohe River are,especially,seriously polluted.