Abstract: This paper evaluated the water quality of the Liquan River Basin in the past three years. Each pollution factor showed a decreasing trend year by year and changed obviously with seasons. The water quality was the worst in spring and the best in winter. In 2019, the water quality of Liquan River did not meet the national standard. TP was the main pollution factor. It was found that non-point source pollution was the main source for TP. Taking effective measures to control non-point source pollution would play a positive role in purifying the water quality of Liquan River.