[Objective] The spatial and temporal evolution characteristics of total nitrogen (TN) and total phosphorus (TP) pollutants in the Bahe River basin and their load relationship with annual runoff were explored, and the spatial distribution law of pollution loads was proposed to provide guidance for watershed planning and control.[Methods] Based on the land use data for 1996 and 2017 and the rainfall data of the Bahe River basin from 2001 to 2017, the current-situation simulation and scenario design were carried out based on GIS technology and the AnnAGNPS model.[Results] ① Comparing the land-use-type data in 2017 with 1996, the areas of forest land and cultivated land type decreased and the areas of construction land and water increased. The property flow quota for construction, the TN load quota, increased, and the TP load quota increased whereas that of the forest type (TN load) and the TP load decreased. For the production flow, the TN and TP loads in the water type were basically unchanged. ② Based on land use data in 2017, the TN pollution load of construction land increased to 16.13 kg/ha compared with that (5.24 kg/ha) in 1996, which partly reflected the severity of urban non-point-source pollution in the Bahe River basin in the past 20 years. ③ The largest areas of runoff were the four sub-basin basins of Bahe River, including the Qingyu River, upper Bahe River, Qinghe River, and Wangchuan River. When the runoff value was greater than 4.00×10⁸ t, the TN and TP pollutant loads were in a high load state. ④ The TP and TN load distributions in the four sub-basins, including the Wangchuan, Kuyu, Daiyu, and Qingyu rivers accounted for 50.32% and 56.09% of the entire river basin, respectively.[Conclusion] At present, non-point-source pollution is the main source of pollution in Baba River basin, especially for urban non-point-source pollution.