[Objective] This paper aims to explore the non-point source pollution in Hongfeng Lake reserve and the relationship with it water quality, and understand the current status of non-point source pollution land, in order to provide the scientific evidence to prevent the non-point source pollution.[Methods] The total nitrogen (TN) and total phosphorus (TP) pollution load of Hongfeng Lake was studied by improved export coefficient model (IECM).[Results] The non-point source pollution emissions of TN and TP in 2016 were 863.78 t and 77.14 t respectively, and the non-point source pollution emissions of TN calculated by the empirical coefficient was 701.19 t, TP was 232.99 t, and the improved output coefficient model incorporated terrain factors increased accuracy greatly. In 2016, TN and TP of non-point source emissions accounted for 73.54% and 82.54% of the total pollution load. Compared with the non-point source pollution load in 2008, TN and TP accounted for 27.03% and 19.69%, respectively, but the water quality was generally Class Ⅱ.[Conclusion] At present, non-point source pollution is the main source of pollution of Hongfeng Lake, but it has little impact on water quality.