Dongzhen Reservoir is the importantwater source for Putian City and its water quality affects the developmentof economy and the society of the city. In recentyears

the ecosystem of the reservoir has been aggravated due to the strengthened human activities. According to the field investigation and the analysis of the monitoring data of water quality

itis easy to find outthatthe major indexes of water quality increase year by year and water quality gradually declines

which brings on the shortage of pollution-induced water. The deteriorated water quality is mainly due to the massive forestexploitation by human being

which leads to severe soil erosion

increased agricultural non-pointsource pollution

strengthened human activities

tre-mendous reservoir sediment

and so on. Then the authors suggestsome comprehensive countermeasures

in-cluding strengthen of dissemination and education

developmentof eco-orchard

improvementof ecological environment

establishmentof eco-compensation mechanism

improvementof monitoring system

enhance-mentof management

and control of agricultural non-pointsource pollution.