Abstract：In anagricultural development watershed,the ecological security will change with the development.After taking NPS (non-point source pollution) into account,this research focuses on Naoli River.Recently,the material balance of the basin has been broken,and the ecological environment has been destroyed,because ofthe agricultural development,and the changes of land use.Then on account of the excessive application of fertilizer and pesticide,the nutrients nitrogen (N) and phosphorus (P) are getting into the water in quantity,which brings serious environmental problems.In order to get the security assessment considering NPS,we need know the detailed N、P loads and habit quality.Based on the SWAT model and InVEST (integrated valuation of ecosystem services and tradeoffs) model,we quantitatively estimated the nutrient delivery ratio and the habit quality of Naoli River in 2000,2006 and 2014.With the results,we get the response of N and P loads and habit quality to spatial and temporal variation.Thenconsidering it,we make the ecological security assessment of Naoli River Basin,and then effective policies and recommendations are discussed.
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