The evaluation index of ecological security system was built using the PSR(pressure—state—response) model

entropy method was applied to define the weights of seventeen assessment indexes

and the Excel software for data processing was used to evaluate the ecological security of Shengzhong Reservoir. Results showed that the ecological security situation from 2004 to 2007 was improved. At last

several environmental protection measures for reservoir ecosystem were discussed

such as banning cage farming fertilizer

strengthening the solid waste and wastewater treatments of reservoir residents

controlling soil erosion

reducing point source and non-point source pollution by nitrogen and phosphorus

preventing the spread of water hyacinth

focusing on the management of water eutrophication

and maintaining the reservoir storage capacity in a reasonable level. At the same time

it should be noted that the new factors such as reservoir fishing or other factors affected the ecological balance of Shengzhong Reservoir.