Abstract: 【Objective】To explore the spatial characteristics,source,and development trend of agricultural non-point source pollution in Shandong Province.【Methods】Inventory analysis and output coefficient method were used to calculate the total emission of chemical oxygen demand（COD）,total nitrogen（TN）,and total phosphorus（TP）,equivalent standard emission,emission intensity per unit area,emission per 10 000 yuan output value of agricultural non-point source pollution from different sources in Shandong Province and various cities from 2000 to 2020.【Results】From 2000 to 2020,the equivalent standard emission of agricultural non-point source pollution decreased by 29.43% in Shandong Province. The average annual contribution rates of equivalent standard emission of TN and TP were 51.48% and 38.70%,respectively,with contribution rates of the two over 90%. Livestock and poultry breeding was the main agricultural non-point source pollution in Shandong Province with TN and TP contribution rates over 60%. The emission per 10 000 yuan output value had decreasing trend. Emission intensity per unit area was high in the west and low in the east. Weifang and Linyi were the high pollution areas. Dezhou,Heze and Liaocheng were the relatively high pollution areas. The average contribution rate of intra-regional differences in the Theil index of agricultural non-point source pollution was 97.8%,and the average inter-regional rate was 2.2%.【Conclusion】The overall trend of agricultural non-point source pollution in Shandong Province was decreasing,but the extensive management characteristics of agricultural production were still prominent. The pollutant with the highest contribution rate was TN. Livestock and poultry breeding was the main source of agricultural non-point source pollution in Shandong Province. Difference in emission intensity per unit area between the eastern and the western regions was predominant. The areas with high agricultural non-point source pollution emissions were mainly distributed in the central and western regions with developed agriculture and dense population. The regional differences of agricultural non-point source pollution in the province were gradually narrowing. And the contribution of intra-regional differences was much greater than that of inter-regional differences.

Key words: Agricultural non-point source pollution, Inventory analysis method, Theil index, Shandong Province