Trend Analysis of Surface Water Quality in Hunan Province

The trend of the surface water quality of Hunan province is analyzed by the seasonal Kendall test method, basing on the main pollutants during 2001-2005.The conclusions are as follows: The pollutions of BOD5 and NH3-N of Xiangjiang river, TP of Yuanjiang river, As and CYN of Lishui river, As,FN and TP of Dongting lake have an obvious upward trend; the pollutions of Cd, Pb, TP and petroleum of Zijiang river, petroleum of Dongting lake have an obvious downward trend.