Agricultural non-point source pollution in Liaohe basin of Jilin Province has been very serious according to the statistical data of nearly ten years.The results showed that among agricultural non-point source pollution in the basin,COD mainly comes from raising livestock and rural life pollution,TN and TP mainly comes from raising livestock and farmland fertilizer.In recent 10 years,COD loss increased from 34093.2 t/a up to 53414.3 t/a,which increased by 56.7%.TN loss increased from 30095.2 t/a up to 40738.7 t/a,which increased by 35.4%.TP loss increased from 2504.3 t/a up to 4606.0 t/a,which increased by 83.9%.